UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549

                                    Form 13F

                              FORM 13F COVER PAGE

Report for the Calendar Year or Quarter Ended:  June 30, 2011

Check here if Amendment [  ]; Amendment Number:
This Amendment (Check only one):  [  ] is a restatement.
                                  [  ]  adds new holdings entries.

Institutional Investment Manager Filing this Report:

Name:     Hennessy Advisors, Inc.
Address:  7250 Redwood Boulevard, Suite 200
          Novato, CA  94945

Form 13F File Number:  028-06715

The institutional investment manager filing this report and the person by whom
it is signed hereby represent that the person signing the report is authorized
to submit it, that all information contained herein is true, correct and
complete, and that it is understood that all required items, statements,
schedules, lists, and tables, are considered integral parts of this form.

Person Signing this Report on Behalf of Reporting Manager:

Name:    Teresa M. Nilsen
Title:   Executive Vice President and Chief Financial Officer
Phone:   (415) 899-1555

Signature, Place, and Date of Signing:

/s/ Teresa M. Nilsen              Novato, CA                   July 25, 2011
--------------------------------------------------------------------------------
Teresa M. Nilsen                  City, State                      Date

Report Type  (Check only one):

[X]   13F HOLDINGS REPORT.  (Check here if all holdings of this reporting
      manager are reported in this report.)

[  ]  13F NOTICE.  (Check here if no holdings reported are in this report,
      and all holdings are reported by other reporting manager(s).)

[  ]  13F COMBINATION REPORT.  (Check here if a portion of the holdings for
      this reporting manager are reported in this report and a portion are
      reported byother reporting manager(s).)


                             FORM 13F SUMMARY PAGE


Report Summary:


Number of Other Included Managers:                0
                                         -------------
Form 13F Information Table Entry Total:         203
                                         -------------
Form 13F Information Table Value Total:    $675,232
                                         -------------
                                          (thousands)


List of Other Included Managers:     NONE



                                                        FORM 13F INFORMATION TABLE

                                         Name of Reporting Manager: Hennessy Advisors, Inc.

                                                           Value   Shares/  Sh/ Put/ Invstmt    Other          Voting Authority
        Name of Issuer         Title of Class     CUSIP   (x1000)  Prn Amt  Prn Call Dscretn   Managers     Sole    Shared   None
------------------------------ ---------------- --------- -------- -------- --- ---- ------- ------------ -------- -------- -------
                                                                                                
A T & T INC                   COM              00206R102   7,970   253,750  SH      SOLE                 253,750
ABBOTT LABORATORIES           COM              002824100   2,852    54,200  SH      SOLE                  54,200
ADVANCE AUTO PARTS INC        COM              00751Y106   5,638    96,400  SH      SOLE                  96,400
AETNA INC                     COM              00817Y108   1,777    40,300  SH      SOLE                  40,300
AIR TRANSPORT SERVICES GROUP  COM              00922R105   3,805   555,500  SH      SOLE                 555,500
ALAMO GROUP INC               COM              011311107     559    23,580  SH      SOLE                  23,580
ALASKA AIR GROUP INC          COM              011659109     726    10,600  SH      SOLE                  10,600
ALTRIA GROUP INC              COM              02209S103   2,792   105,700  SH      SOLE                 105,700
AMERCO                        COM              023586100   3,375    35,100  SH      SOLE                  35,100
AMERICAN INTERNATIONAL GROUP  COM              026874784     399    13,600  SH      SOLE                  13,600
AMERIGROUP CORP               COM              03073T102   7,625   108,200  SH      SOLE                 108,200
ANN, INC                      COM              035623107   3,576   137,000  SH      SOLE                 137,000
APOLLO GROUP INC              CL A             037604105   1,800    41,200  SH      SOLE                  41,200
APPLIED INDUSTRIAL TECH INC   COM              03820C105   4,996   140,300  SH      SOLE                 140,300
APPLIED MATERIALS INC         COM              038222105   1,504   115,600  SH      SOLE                 115,600
ASHFORD HOSPITALITY TRUST     COM              044103109   4,480   359,800  SH      SOLE                 359,800
ATLAS PIPELINE HOLDINGS LP    COM              04930A104   5,389   248,000  SH      SOLE                 248,000
ATLAS PIPELINE PARTNER LP     COM              049392103   4,865   147,600  SH      SOLE                 147,600
AUTOLIV INC                   COM              052800109   7,115    90,700  SH      SOLE                  90,700
AUTOMATIC DATA PROCESSING     COM              053015103   3,029    57,500  SH      SOLE                  57,500
AXCELIS TECHNOLOGIES INC      COM              054540109      20    12,400  SH      SOLE                  12,400
BANCO MACRO SA                SPON ADR B       05961W105     615    16,300  SH      SOLE                  16,300
BCE INC                       COM NEW          05534B760   3,127    79,600  SH      SOLE                  79,600
BEST BUY CO INC               COM              086516101   1,781    56,700  SH      SOLE                  56,700
BOEING CO                     COM              097023105   1,612    21,800  SH      SOLE                  21,800
BORGWARNER INC                COM              099724106  11,488   142,200  SH      SOLE                 142,200
BRISTOL MYERS SQUIBB          COM              110122108   2,870    99,100  SH      SOLE                  99,100
BROWN SHOE CO INC             COM              115736100     321    30,100  SH      SOLE                  30,100
BUCKEYE TECHNOLOGIES INC      COM              118255108   4,716   174,800  SH      SOLE                 174,800
CABLEVISION SYS CORP          CL A NY CABLVS   12686C109   1,771    48,900  SH      SOLE                  48,900
CALLON PETROLEUM CO/DE        COM              13123X102     576    82,000  SH      SOLE                  82,000
CAMPBELL SOUP CO              COM              134429109   4,371   126,500  SH      SOLE                 126,500
CARDTRONICS INC               COM              14161H108     933    39,800  SH      SOLE                  39,800
CASCADE CORP                  COM              147195101     609    12,800  SH      SOLE                  12,800
CENTURYLINK INC               COM              156700106   2,490    61,600  SH      SOLE                  61,600
CHEVRON CORP                  COM              166764100   9,353    90,950  SH      SOLE                  90,950
CHINA MOBILE LTD              SPONSORED ADR    16941M109   2,381    50,900  SH      SOLE                  50,900
CIGNA CORP                    COM              125509109   1,857    36,100  SH      SOLE                  36,100
CIMAREX ENERGY CO             COM              171798101   1,673    18,600  SH      SOLE                  18,600
CLEARWATER PAPER CORP         COM              18538R103     580     8,500  SH      SOLE                   8,500
CLIFFS NATURAL RESOURCES INC  COM              18683K101   1,858    20,100  SH      SOLE                  20,100
COCA-COLA COMPANY             COM              191216100     343     5,100  SH      SOLE                   5,100
COMMERCIAL VEHICLE GROUP INC  COM              202608105   3,580   252,300  SH      SOLE                 252,300
COMP SIDERURGICA NAC          SPONSORED ADR    20440W105   1,913   153,500  SH      SOLE                 153,500
COMPLETE PRODUCTION SERVICES  COM              20453E109   6,509   195,100  SH      SOLE                 195,100
CONAGRA FOODS INC             COM              205887102   3,115   120,700  SH      SOLE                 120,700
CONOCOPHILLIPS                COM              20825C104   3,158    42,000  SH      SOLE                  42,000
CONSOLIDATED GRAPHICS INC     COM              209341106     593    10,800  SH      SOLE                  10,800
COST PLUS INC                 COM              221485105   3,564   356,400  SH      SOLE                 356,400
CPI CORP                      COM              125902106   1,688   128,400  SH      SOLE                 128,400
CROCS INC                     COM              227046109  10,400   403,900  SH      SOLE                 403,900
DDI CORP                      COM              233162502   3,035   318,150  SH      SOLE                 318,150
DELL INC                      COM              24702R101   1,719   103,100  SH      SOLE                 103,100
DIAGEO PLC                    SPON ADR NEW     25243Q205   2,857    34,900  SH      SOLE                  34,900
DIAMOND OFFSHRE DRILLING INC  COM              25271C102   1,732    24,600  SH      SOLE                  24,600
DILLARDS INC                  CL A             254067101   5,261   100,900  SH      SOLE                 100,900
DINEEQUITY INC                COM              254423106   3,455    66,100  SH      SOLE                  66,100
DIRECTV                       COM              25490A101   1,769    34,800  SH      SOLE                  34,800
DISH NETWORK CORP             COM              25470M109   1,803    58,800  SH      SOLE                  58,800
DOLLAR TREE INC               COM              256746108   5,809    87,200  SH      SOLE                  87,200
DU PONT (E I) DE NEMOURS      COM              263534109   7,821   144,700  SH      SOLE                 144,700
EASTMAN CHEMICAL CO           COM              277432100   1,664    16,300  SH      SOLE                  16,300
EMCORE CORP                   COM              290846104      42    15,360  SH      SOLE                  15,360
ENI SPA                       SPONSORED ADR    26874R108   2,801    58,900  SH      SOLE                  58,900
ENTERPRISE PRODS PRTNER  -LP  COM              293792107   2,606    60,300  SH      SOLE                  60,300
ESTERLINE TECHNOLOGIES CORP   COM              297425100     756     9,900  SH      SOLE                   9,900
EXPRESS-1 EXPEDITED SOLTNS    COM              30217Q108      41    13,140  SH      SOLE                  13,140
EXXON MOBIL CORP              COM              30231G102   1,733    21,300  SH      SOLE                  21,300
FAMILY DOLLAR STORES          COM              307000109   5,051    96,100  SH      SOLE                  96,100
FERRO CORP                    COM              315405100   4,516   336,000  SH      SOLE                 336,000
FOREST LABORATORIES           COM              345838106   2,018    51,300  SH      SOLE                  51,300
FRANCE TELECOM                SPONSORED ADR    35177Q105   2,427   114,000  SH      SOLE                 114,000
FREEPORT-MCMORAN COP&GOLD     COM              35671D857   1,889    35,700  SH      SOLE                  35,700
GAP INC                       COM              364760108   1,365    75,400  SH      SOLE                  75,400
GARDNER DENVER INC            COM              365558105     866    10,300  SH      SOLE                  10,300
GENERAL COMMUNICATION         CL A             369385109   3,552   294,300  SH      SOLE                 294,300
GENERAL DYNAMICS CORP         COM              369550108   1,721    23,100  SH      SOLE                  23,100
GENERAL ELECTRIC CO.          COM              369604103     622    33,000  SH      SOLE                  33,000
GENERAL MILLS INC             COM              370334104   4,362   117,200  SH      SOLE                 117,200
GILEAD SCIENCES INC           COM              375558103   1,752    42,300  SH      SOLE                  42,300
GLAXOSMITHKLINE PLC           SPONSORED ADR    37733W105   2,853    66,500  SH      SOLE                  66,500
GREENBRIER COMPANIES INC      COM              393657101   3,168   160,300  SH      SOLE                 160,300
GRUPO FINANCIERO GALICIA      SP ADR 10 SH B   399909100   3,213   237,300  SH      SOLE                 237,300
HARRIS CORP                   COM              413875105   1,586    35,200  SH      SOLE                  35,200
HCA HOLDINGS INC              COM              40412C101   1,647    49,900  SH      SOLE                  49,900
HEALTHSPRING INC              COM              42224N101   8,341   180,900  SH      SOLE                 180,900
HEINZ (H J) CO                COM              423074103   2,888    54,200  SH      SOLE                  54,200
HEWLETT-PACKARD CO            COM              428236103   1,529    42,000  SH      SOLE                  42,000
HILL-ROM HOLDINGS INC         COM              431475102     741    16,100  SH      SOLE                  16,100
HOME DEPOT INC                COM              437076102   1,844    50,900  SH      SOLE                  50,900
HSN INC                       COM              404303109   4,543   138,000  SH      SOLE                 138,000
HUMANA INC                    COM              444859102   1,772    22,000  SH      SOLE                  22,000
IDT CORP                      COM              448947507   4,831   178,800  SH      SOLE                 178,800
INNOSPEC INC                  COM              45768S105   5,670   168,700  SH      SOLE                 168,700
INTEL CORP                    COM              458140100   9,427   425,400  SH      SOLE                 425,400
INTERFACE INC                 CL A             458665106   5,375   277,500  SH      SOLE                 277,500
INTL BUSINESS MACHINES CORP   COM              459200101   1,750    10,200  SH      SOLE                  10,200
IPASS INC                     COM              46261V108      34    22,080  SH      SOLE                  22,080
ISTAR FINANCIAL INC           COM              45031U101   4,264   525,800  SH      SOLE                 525,800
JOHNSON & JOHNSON             COM              478160104   7,680   115,450  SH      SOLE                 115,450
JONES LANG LASALLE INC        COM              48020Q107   4,828    51,200  SH      SOLE                  51,200
KELLOGG CO                    COM              487836108   2,960    53,500  SH      SOLE                  53,500
KEMET CORP                    COM              488360207   4,076   285,200  SH      SOLE                 285,200
KIMBERLY-CLARK CORP           COM              494368103   4,499    67,600  SH      SOLE                  67,600
KRAFT FOODS INC               COM              50075N104   8,098   229,850  SH      SOLE                 229,850
KRISPY KREME DOUGHNUTS INC    COM              501014104   4,821   506,990  SH      SOLE                 506,990
KT CORP                       SPONSORED ADR    48268K101   2,313   119,000  SH      SOLE                 119,000
LAM RESEARCH CORP             COM              512807108   1,616    36,500  SH      SOLE                  36,500
LEXMARK INTL INC              CL A             529771107   2,908    99,400  SH      SOLE                  99,400
LIBBEY INC                    COM              529898108   4,718   290,900  SH      SOLE                 290,900
LIFETIME BRANDS INC           COM              53222Q103     372    31,700  SH      SOLE                  31,700
LILLY (ELI) & CO              COM              532457108   4,515   120,300  SH      SOLE                 120,300
LIMITED BRANDS INC            COM              532716107   1,580    41,100  SH      SOLE                  41,100
LIONBRIDGE TECHNOLOGIES INC   COM              536252109     318   100,100  SH      SOLE                 100,100
LOCKHEED MARTIN CORP          COM              539830109   4,802    59,300  SH      SOLE                  59,300
LORAL SPACE & COMMUNICATIONS  COM              543881106     841    12,100  SH      SOLE                  12,100
LUBRIZOL CORP                 COM              549271104   5,290    39,400  SH      SOLE                  39,400
MACQUARIE INFRASTRUCT CO LLC  COM              55608B105     996    36,100  SH      SOLE                  36,100
MAGELLAN HEALTH SERVICES INC  COM              559079207   5,091    93,000  SH      SOLE                  93,000
MAGNETEK INC                  COM              559424106      30    16,280  SH      SOLE                  16,280
MARSH & MCLENNAN COS          COM              571748102   3,197   102,500  SH      SOLE                 102,500
MATERION CORP                 COM              576690101   3,531    95,500  SH      SOLE                  95,500
MATTEL INC                    COM              577081102   4,838   176,000  SH      SOLE                 176,000
MCDONALD'S CORPORATION        COM              580135101   3,609    42,800  SH      SOLE                  42,800
MEDCATH CORP                  COM              58404W109   3,703   272,460  SH      SOLE                 272,460
MEDIA GENERAL                 CL A             584404107     178    46,600  SH      SOLE                  46,600
MERCER INTL INC               COM              588056101   5,449   540,600  SH      SOLE                 540,600
MERCK & CO                    COM              58933Y105   7,594   215,200  SH      SOLE                 215,200
MERITOR INC                   COM              59001K100   5,166   322,100  SH      SOLE                 322,100
MICROSOFT CORP                COM              594918104   1,768    68,000  SH      SOLE                  68,000
MOBILE TELESYSTEMS            SPONSORED ADR    607409109   2,319   121,900  SH      SOLE                 121,900
MRV COMMUNICATIONS INC        COM              553477100      27    19,310  SH      SOLE                  19,310
NACCO INDUSTRIES              CL A             629579103   3,815    39,400  SH      SOLE                  39,400
NEENAH PAPER INC              COM              640079109     549    25,800  SH      SOLE                  25,800
NEWCASTLE INVESTMENT CORP     COM              65105M108   3,584   620,000  SH      SOLE                 620,000
NEWMONT MINING CORP           COM              651639106   1,743    32,300  SH      SOLE                  32,300
NEWPORT CORP                  COM              651824104   3,903   214,800  SH      SOLE                 214,800
NOKIA CORP                    SPONSORED ADR    654902204   1,625   253,100  SH      SOLE                 253,100
NORDSTROM INC                 COM              655664100   1,662    35,400  SH      SOLE                  35,400
OPNEXT INC                    COM              68375V105      24    10,710  SH      SOLE                  10,710
OWENS CORNING                 COM              690742101     583    15,600  SH      SOLE                  15,600
PACER INTERNATIONAL INC       COM              69373H106     330    70,000  SH      SOLE                  70,000
PETROCHINA CO LTD             SPONSORED ADR    71646E100   2,950    20,200  SH      SOLE                  20,200
PFIZER INC                    COM              717081103   8,643   419,550  SH      SOLE                 419,550
PHILIP MORRIS INTERNATIONAL   COM              718172109   2,931    43,900  SH      SOLE                  43,900
PIER 1 IMPORTS INC/DE         COM              720279108   4,029   348,200  SH      SOLE                 348,200
PITNEY BOWES INC              COM              724479100   2,570   111,800  SH      SOLE                 111,800
POLYONE CORP                  COM              73179P106   5,732   370,500  SH      SOLE                 370,500
POWER-ONE INC                 COM              73930R102   3,217   397,200  SH      SOLE                 397,200
PRICESMART INC                COM              741511109   4,862    94,900  SH      SOLE                  94,900
PROCTER & GAMBLE CO           COM              742718109   1,561    24,550  SH      SOLE                  24,550
PROGRESSIVE CORP-OHIO         COM              743315103   1,723    80,600  SH      SOLE                  80,600
QUAKER CHEMICAL CORP          COM              747316107   4,600   106,960  SH      SOLE                 106,960
QUIKSILVER INC                COM              74838C106   3,396   722,500  SH      SOLE                 722,500
RAYTHEON CO                   COM              755111507   4,536    91,000  SH      SOLE                  91,000
ROCHE HOLDING LTD             ADR              771195104   3,021    72,000  SH      SOLE                  72,000
ROCKWOOD HOLDINGS INC         COM              774415103   7,381   133,500  SH      SOLE                 133,500
ROYAL DUTCH SHELL PLC         SPON ADR A       780259206   2,838    39,900  SH      SOLE                  39,900
RUBY TUESDAY INC              COM              781182100   2,894   268,500  SH      SOLE                 268,500
SANOFI-AVENTIS                SPONSORED ADR    80105N105   3,121    77,700  SH      SOLE                  77,700
SAUER-DANFOSS INC             COM              804137107   5,881   116,700  SH      SOLE                 116,700
SELECT COMFORT CORP           COM              81616X103     953    53,000  SH      SOLE                  53,000
SINCLAIR BROADCAST GP         CL A             829226109     831    75,700  SH      SOLE                  75,700
SKECHERS U S A INC            COM              830566105     182    12,600  SH      SOLE                  12,600
STANDEX INTERNATIONAL CORP    COM              854231107     580    18,900  SH      SOLE                  18,900
STATOIL ASA                   SPONSORED ADR    85771P102   3,125   122,800  SH      SOLE                 122,800
SUNOPTA INC                   ADR              8676EP108   3,470   488,100  SH      SOLE                 488,100
SXC HEALTH SOLUTIONS CORP     COM              78505P100     807    13,700  SH      SOLE                  13,700
SYSCO CORP                    COM              871829107   4,537   145,500  SH      SOLE                 145,500
TAIWAN SEMICONDUCTOR          SPONSORED ADR    874039100   2,975   235,900  SH      SOLE                 235,900
TELEFONICA SA                 SPONSORED ADR    879382208   2,598   106,100  SH      SOLE                 106,100
TENNANT CO                    COM              880345103     583    14,600  SH      SOLE                  14,600
TENNECO INC                   COM              880349105  10,550   239,400  SH      SOLE                 239,400
TEXAS INSTRUMENTS INC         COM              882508104   1,622    49,400  SH      SOLE                  49,400
TIMKEN CO                     COM              887389104   5,509   109,300  SH      SOLE                 109,300
TITAN INTERNATIONAL INC       COM              88830M102   4,801   197,900  SH      SOLE                 197,900
TJX COMPANIES INC             COM              872540109   1,697    32,300  SH      SOLE                  32,300
TORO CO                       COM              891092108   4,501    74,400  SH      SOLE                  74,400
TOTAL SA                      SPONSORED ADR    89151E109   2,811    48,600  SH      SOLE                  48,600
TPC GROUP INC                 COM              89236Y104   5,142   131,100  SH      SOLE                 131,100
TRACTOR SUPPLY CO             COM              892356106  12,453   186,200  SH      SOLE                 186,200
TRIMAS CORP                   COM NEW          896215209   5,113   206,600  SH      SOLE                 206,600
TRW AUTOMOTIVE HOLDINGS CORP  COM              87264S106  13,707   232,200  SH      SOLE                 232,200
TUESDAY MORNING CORP          COM              899035505   3,092   664,900  SH      SOLE                 664,900
ULTA SALON COSMETCS & FRAG    COM              90384S303  10,966   169,800  SH      SOLE                 169,800
ULTRA CLEAN HOLDINGS INC      COM              90385V107     540    59,500  SH      SOLE                  59,500
UNITED CONTINENTAL HLDGS INC  COM              910047109   7,991   353,100  SH      SOLE                 353,100
UNITED RENTALS INC            COM              911363109   3,965   156,100  SH      SOLE                 156,100
UNITEDHEALTH GROUP INC        COM              91324P102   1,780    34,500  SH      SOLE                  34,500
UNIVERSAL AMERICAN CORP       COM              91338E101     351    32,100  SH      SOLE                  32,100
US AIRWAYS GROUP INC          COM              90341W108   7,568   849,400  SH      SOLE                 849,400
VALASSIS COMMUNICATIONS INC   COM              918866104   4,221   139,300  SH      SOLE                 139,300
VERIZON COMMUNICATIONS        COM              92343V104   8,267   222,050  SH      SOLE                 222,050
VODAFONE GROUP PLC            SPONS ADR NEW    92857W209   2,501    93,600  SH      SOLE                  93,600
WALGREEN CO                   COM              931422109   1,660    39,100  SH      SOLE                  39,100
WAL-MART STORES INC           COM              931142103   1,663    31,300  SH      SOLE                  31,300
WASTE MANAGEMENT INC          COM              94106L109   2,780    74,600  SH      SOLE                  74,600
WESTELL TECH INC              CL A             957541105      38    10,580  SH      SOLE                  10,580
WESTERN REFINING INC          COM              959319104   6,245   345,600  SH      SOLE                 345,600
WHIRLPOOL CORP                COM              963320106     423     5,200  SH      SOLE                   5,200
WILLIAMS-SONOMA INC           COM              969904101   4,933   135,200  SH      SOLE                 135,200
WYNDHAM WORLDWIDE CORP        COM              98310W108   5,101   151,600  SH      SOLE                 151,600
ZIONS BANCORPORATION          COM              989701107     507    21,100  SH      SOLE                  21,100
TOTAL                                                    675,232