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, 2007

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:    The Bank of Nova Scotia
Address: 40 King St. West
         Scotia Plaza 9th Floor
         Toronto, Ontario  M5H 1H1

13F File Number:  28-11475

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:      Maria Theofilaktidis
Title:     Vice President, Financial Accounting and Controls
Phone:     416-866-4269

Signature, Place, and Date of Signing:

     /s/ Maria Theofilaktidis     Toronto, Ontario, Canada     August 14, 2007


Report Type (Check only one.):

[  ]         13F HOLDINGS REPORT.

[  ]         13F NOTICE.

[ X]         13F COMBINATION REPORT.


List of Other Managers Reporting for this Manager:

       Form 13F File Number          Name

       28-11461                      Scotia Capital Inc.
       28-11460                      Scotia Cassels Investment Counsel Ltd.
       28-11459                      Bank of Nova Scotia Trust Co.



                              FORM 13F SUMMARY PAGE


Report Summary:

Number of Other Included Managers:         1

Form13F Information Table Entry Total:     156

Form13F Information Table Value Total:     $19,671,792 (thousands)


List of Other Included Managers:

Provide a numbered list of the name(s) and Form 13F file number(s) of all
institutional managers with respect to which this report is filed, other
than the manager filing this report.

No.  13F File Number               Name


     28-11472                      BNS Investment Inc.




                                    
                                                     FORM 13F INFORMATION TABLE
                                                             VALUE  SHARES/ SH/ PUT/ INVSTMT  OTHER            VOTING AUTHORITY
NAME OF ISSUER                 TITLE OF CLASS   CUSIP     (x$1000)  PRN AMT PRN CALL DSCRETN MANAGERS         SOLE   SHARED     NONE
------------------------------ ---------------- --------- -------- -------- --- ---- ------- ------------ -------- -------- --------
3M CO                          COM              88579Y101     1498    17245 SH       DEFINED 1               17245        0        0
ABITIBI-CONSOLIDATED INC       COM              003924107    18766  6430732 SH       SOLE                  6430732        0        0
AGNICO EAGLE MINES LTD         COM              008474108     7589   208807 SH       SOLE                   208807        0        0
AGRIUM INC                     COM              008916108     9516   217136 SH       SOLE                   217136        0        0
ALCAN INC                      COM              013716105   194316  2382325 SH       SOLE                  2382325        0        0
ALCOA INC                      COM              013817101      724    17845 SH       DEFINED 1               17845        0        0
ALTRIA GROUP INC               COM              02209S103     1246    17745 SH       DEFINED 1               17745        0        0
AMERICAN EXPRESS CO            COM              025816109     1087    17745 SH       DEFINED 1               17745        0        0
AMERICAN INTL GROUP INC        COM              026874107     1242    17715 SH       DEFINED 1               17715        0        0
AMGEN INC                      COM              031162100     5529   100000 SH       SOLE                   100000        0        0
ANADARKO PETE CORP             COM              032511107     2600    50000 SH       SOLE                    50000        0        0
ANHEUSER BUSCH COS INC         COM              035229103     3912    75000 SH       SOLE                    75000        0        0
APPLE INC                      COM              037833100     3051    25000 SH       SOLE                    25000        0        0
AT&T INC                       COM              00206R102      716    17245 SH       DEFINED 1               17245        0        0
BALLARD PWR SYS INC            COM              05858H104      336    63000 SH       SOLE                    63000        0        0
BANK MONTREAL QUE              COM              063671101  1422618 22158739 SH       SOLE                 22158739        0        0
BANK OF AMERICA CORPORATION    COM              060505104    17112   350000 SH       SOLE                   350000        0        0
BARRICK GOLD CORP              COM              067901108   114394  3933988 SH       SOLE                  3933988        0        0
BAYTEX ENERGY TR               TRUST UNIT       073176109     4349   217100 SH       SOLE                   217100        0        0
BCE INC                        COM NEW          05534B760    24252   640500 SH       SOLE    1              640500        0        0
BCE INC                        COM NEW          05534B760  1304777 34459822 SH       SOLE                 34459822        0        0
BEST BUY INC                   COM              086516101     9334   200000 SH       SOLE                   200000        0        0
BIOVAIL CORP                   COM              09067J109     6121   240207 SH       SOLE                   240207        0        0
BOEING CO                      COM              097023105     1612    16745 SH       DEFINED 1               16745        0        0
BRISTOL MYERS SQUIBB CO        COM              110122108     2367    75000 SH       SOLE                    75000        0        0
BROOKFIELD ASSET MGMT INC      CL A LTD VT SH   112585104   729218 18233027 SH       SOLE                 18233027        0        0
BROOKFIELD PPTYS CORP          COM              112900105    30832  1263885 SH       SOLE                  1263885        0        0
CAE INC                        COM              124765108    22188  1664757 SH       SOLE                  1664757        0        0
CAMECO CORP                    COM              13321L108    49775   982039 SH       SOLE                   982039        0        0
CANADIAN NAT RES LTD           COM              136385101   182039  2740102 SH       SOLE                  2740102        0        0
CANADIAN NATL RY CO            COM              136375102   365772  7189918 SH       SOLE                  7189918        0        0
CANADIAN PAC RY LTD            COM              13645T100    55252   800128 SH       SOLE                   800128        0        0
CANETIC RES TR                 COM              137513107    11746   722500 SH       SOLE                   722500        0        0
CATERPILLAR INC DEL            COM              149123101     1351    17240 SH       DEFINED 1               17240        0        0
CDN IMPERIAL BK OF COMMERCE    COM              136069101  1364286 15142307 SH       SOLE                 15142307        0        0
CELESTICA INC                  SUB VTG SHS      15101Q108     1961   310960 SH       SOLE                   310960        0        0
CENTENNIAL COMMUNCTNS CORP N   CL A NEW         15133V208      245    25845 SH       SOLE                    25845        0        0
CHC HELICOPTER CORP            CL A SUB VTG     12541C203    30200  1170000 SH       SOLE                  1170000        0        0
CHESAPEAKE ENERGY CORP         COM              165167107     3460   100000 SH       SOLE                   100000        0        0
CISCO SYS INC                  COM              17275R102      501    18655 SH       DEFINED 1               18655        0        0
CITIGROUP INC                  COM              172967101      894    17430 SH       DEFINED 1               17430        0        0
CITIGROUP INC                  COM              172967101    15387   300000 SH       SOLE                   300000        0        0
COCA COLA CO                   COM              191216100      929    17745 SH       DEFINED 1               17745        0        0
COCA COLA CO                   COM              191216100     2616    50000 SH       SOLE                    50000        0        0
COGNOS INC                     COM              19244C109     5595   140331 SH       SOLE                   140331        0        0
CONCUR TECHNOLOGIES INC        COM              206708109      336    14709 SH       SOLE                    14709        0        0
CORUS ENTERTAINMENT INC        COM CL B NON VTG 220874101    15960   341433 SH       SOLE                   341433        0        0
COTT CORP QUE                  COM              22163N106     1626   112078 SH       SOLE                   112078        0        0
CVS CAREMARK CORPORATION       COM              126650100    12758   350000 SH       SOLE                   350000        0        0
DISNEY WALT CO                 COM DISNEY       254687106      606    17745 SH       DEFINED 1               17745        0        0
DORAL FINL CORP                COM              25811P100      295   250000 SH       SOLE                   250000        0        0
DOW CHEM CO                    COM              260543103     3317    75000 SH       SOLE                    75000        0        0
DU PONT E I DE NEMOURS & CO    COM              263534109      857    16845 SH       DEFINED 1               16845        0        0
ENBRIDGE INC                   COM              29250N105   534725 15868984 SH       SOLE                 15868984        0        0
ENCANA CORP                    COM              292505104   301664  4905262 SH       SOLE                  4905262        0        0
ENERGY METALS CORP             COM              29271B106     1537   105000 SH       SOLE                   105000        0        0
ENERPLUS RES FD                UNIT TR G NEW    29274D604    37733   802892 SH       SOLE                   802892        0        0
ENSCO INTL INC                 COM              26874Q100     9152   150000 SH       SOLE                   150000        0        0
ENTERRA ENERGY TR              TR UNIT          29381P102     1354   225000 SH       SOLE                   225000        0        0
EXXON MOBIL CORP               COM              30231G102     1490    17745 SH       DEFINED 1               17745        0        0
FORDING CDN COAL TR            TR UNIT          345425102    11216   341420 SH       SOLE                   341420        0        0
GENERAL ELECTRIC CO            COM              369604103     1263    33345 SH       DEFINED 1               33345        0        0
GENERAL ELECTRIC CO            COM              369604103      957    25000 SH       SOLE                    25000        0        0
GENERAL MTRS CORP              COM              370442105      675    17845 SH       DEFINED 1               17845        0        0
GENEREX BIOTECHNOLOGY CP DEL   COM              371485103     2408  1360300 SH       SOLE                  1360300        0        0
GOLDCORP INC NEW               COM              380956409    31430  1324052 SH       SOLE                  1324052        0        0
HALLIBURTON CO                 COM              406216101     3450   100000 SH       SOLE                   100000        0        0
HARVEST ENERGY TR              TRUST UNIT       41752X101    14072   455000 SH       SOLE                   455000        0        0
HEWLETT PACKARD CO             COM              428236103      755    16895 SH       DEFINED 1               16895        0        0
HOME DEPOT INC                 COM              437076102      699    17745 SH       DEFINED 1               17745        0        0
HONEYWELL INTL INC             COM              438516106     1000    17745 SH       DEFINED 1               17745        0        0
IMPERIAL OIL LTD               COM NEW          453038408   398411  8559534 SH       SOLE                  8559534        0        0
INTEL CORP                     COM              458140100     1083    47745 SH       DEFINED 1               47745        0        0
INTEL CORP                     COM              458140100     7122   300000 SH       SOLE                   300000        0        0
INTERNATIONAL BUSINESS MACHS   COM              459200101     1869    17745 SH       DEFINED 1               17745        0        0
INTEROIL CORP                  COM              460951106     4745   246970 SH       SOLE                   246970        0        0
IPSCO INC                      COM              462622101    11650    73699 SH       SOLE                    73699        0        0
ISHARES INC                    MSCI MEXICO      464286822     1547    25000 SH       SOLE                    25000        0        0
ISHARES INC                    MSCI FRANCE      464286707     4799   125000 SH       SOLE                   125000        0        0
ISHARES TR                     DJ US REAL EST   464287739     3677    47630 SH       SOLE                    47630        0        0
ISHARES TR                     FTSE XNHUA IDX   464287184     3672    28500 SH       SOLE                    28500        0        0
ISHARES TR                     MSCI EAFE IDX    464287465     1754    21710 SH       SOLE                    21710        0        0
ISHARES TR                     MSCI EMERG MKT   464287234     5424    41200 SH       SOLE                    41200        0        0
JOHNSON & JOHNSON              COM              478160104     1441    23245 SH       DEFINED 1               23245        0        0
JOHNSON & JOHNSON              COM              478160104     4622    75000 SH       SOLE                    75000        0        0
JP MORGAN CHASE & CO           COM              46625H100      861    17745 SH       DEFINED 1               17745        0        0
KINROSS GOLD CORP              COM NO PAR       496902404    10732   922833 SH       SOLE                   922833        0        0
LUNDIN MINING CORP             COM              550372106     5397   447153 SH       SOLE                   447153        0        0
MAGNA INTL INC                 CL A             559222401   327160  3574931 SH       SOLE                  3574931        0        0
MANULIFE FINL CORP             COM              56501R106  1900258 50816643 SH       SOLE                 50816643        0        0
MARKET VECTORS ETF TR          GOLD MINER ETF   57060U100     1229    32500 SH       SOLE                    32500        0        0
MASTERCARD INC                 CL A             57636Q104     8290    55433 SH       SOLE                    55433        0        0
MCDONALDS CORP                 COM              580135101      902    17745 SH       DEFINED 1               17745        0        0
MDS INC                        COM              55269P302     7468   366648 SH       SOLE                   366648        0        0
MERCK & CO INC                 COM              589331107      860    17245 SH       DEFINED 1               17245        0        0
METHANEX CORP                  COM              59151K108    34744  1399998 SH       SOLE                  1399998        0        0
MI DEVS INC                    CL A SUB VTG     55304X104    34922   959412 SH       SOLE                   959412        0        0
MICROSOFT CORP                 COM              594918104      951    31745 SH       DEFINED 1               31745        0        0
MOLSON COORS BREWING CO        CL B             60871R209     3701    40091 SH       SOLE                    40091        0        0
NEUROCHEM INC                  COM              64125K101     1593   245900 SH       SOLE                   245900        0        0
NEXEN INC                      COM              65334H102    89136  2877741 SH       SOLE                  2877741        0        0
NISOURCE INC                   COM              65473P105     6213   300000 SH       SOLE                   300000        0        0
NORTEL NETWORKS CORP NEW       COM NEW          656568508    16433   681764 SH       SOLE                   681764        0        0
NOVA CHEMICALS CORP            COM              66977W109    63437  1774842 SH       SOLE                  1774842        0        0
OPPENHEIMER HLDGS INC          CL A NON VTG     683797104      429     8336 SH       SOLE                     8336        0        0
ORBITAL SCIENCES CORP          COM              685564106      305    14500 SH       DEFINED 1                   0        0    14500
PATTERSON UTI ENERGY INC       COM              703481101     7863   300000 SH       SOLE                   300000        0        0
PENN WEST ENERGY TR            TR UNIT          707885109    31766   950138 SH       SOLE                   950138        0        0
PERU COPPER INC                COM              715455101     1171   192000 SH       SOLE                   192000        0        0
PETRO-CDA                      COM              71644E102   156771  2943153 SH       SOLE                  2943153        0        0
PFIZER INC                     COM              717081103      441    17245 SH       DEFINED 1               17245        0        0
PFIZER INC                     COM              717081103    19178   750000 SH       SOLE                   750000        0        0
POPULAR INC                    COM              733174106     2411   150000 SH       SOLE                   150000        0        0
POTASH CORP SASK INC           COM              73755L107    82809  1059369 SH       SOLE                  1059369        0        0
PRECISION DRILLING TR          TR UNIT          740215108     5431   222531 SH       SOLE                   222531        0        0
PRIMEWEST ENERGY TR            TR UNIT NEW      741930309     3417   162600 SH       SOLE                   162600        0        0
PROCTER & GAMBLE CO            COM              742718109     1084    17695 SH       DEFINED 1               17695        0        0
PROVIDENT ENERGY TR            TR UNIT          74386K104     4501   383000 SH       SOLE                   383000        0        0
QUEBECOR WORLD INC             COM NON-VTG      748203106     1398   114334 SH       SOLE                   114334        0        0
RESEARCH IN MOTION LTD         COM              760975102    49314   245051 SH       SOLE                   245051        0        0
ROGERS COMMUNICATIONS INC      CL B             775109200    22832   535554 SH       SOLE                   535554        0        0
ROYAL BK CDA MONTREAL QUE      COM              780087102  3023929 56900286 SH       SOLE                 56900286        0        0
SAVVIS INC                     COM NEW          805423308     1013    20468 SH       SOLE                    20468        0        0
SCHERING PLOUGH CORP           COM              806605101     1623    53325 SH       SOLE                    53325        0        0
SHAW COMMUNICATIONS INC        CL B CONV        82028K200    16864   399083 SH       SOLE                   399083        0        0
SILICON IMAGE INC              COM              82705T102      858   100000 SH       SOLE                   100000        0        0
SILVER WHEATON CORP            COM              828336107      902    76294 SH       SOLE                    76294        0        0
SLM CORP                       COM              78442P106   226301  3930200 SH       SOLE                  3930200        0        0
SMTC CORP                      COM NEW          832682207     2739   469082 SH       SOLE                   469082        0        0
SOURCE INTERLINK COS INC       COM NEW          836151209      299    60035 SH       SOLE                    60035        0        0
SOUTHWEST AIRLS CO             COM              844741108      373    25000 SH       SOLE                    25000        0        0
SPDR TR                        UNIT SER 1       78462F103     7794    51810 SH       SOLE                    51810        0        0
STORM CAT ENERGY CORP          COM              862168101      831   750000 SH       SOLE                   750000        0        0
SUN LIFE FINL INC              COM              866796105   926958 19455895 SH       SOLE                 19455895        0        0
SUNCOR ENERGY INC              COM              867229106   189877  2108122 SH       SOLE                  2108122        0        0
TALISMAN ENERGY INC            COM              87425E103   449554 23250255 SH       SOLE                 23250255        0        0
TATA MTRS LTD                  SPONSORED ADR    876568502     3001   185700 SH       SOLE                   185700        0        0
TECK COMINCO LTD               CL B             878742204   524183 12355399 SH       SOLE                 12355399        0        0
TELUS CORP                     NON-VTG SHS      87971M202   344994  5857512 SH       SOLE                  5857512        0        0
THOMSON CORP                   COM              884903105   406308  9951282 SH       SOLE                  9951282        0        0
TIM HORTONS INC                COM              88706M103     9132   296175 SH       SOLE                   296175        0        0
TORONTO DOMINION BK ONT        COM NEW          891160509  2177802 31845054 SH       SOLE                 31845054        0        0
TRANSALTA CORP                 COM              89346D107   158071  6295670 SH       SOLE                  6295670        0        0
TRANSALTA CORP                 COM              89346D107    53982  2150000 SH       SOLE    1             2150000        0        0
TRANSCANADA CORP               COM              89353D107    30092   875000 SH       SOLE    1              875000        0        0
TRANSCANADA CORP               COM              89353D107   702866 20437591 SH       SOLE                 20437591        0        0
UNITED TECHNOLOGIES CORP       COM              913017109     1224    17240 SH       DEFINED 1               17240        0        0
VALERO ENERGY CORP NEW         COM              91913Y100     7386   100000 SH       SOLE                   100000        0        0
VERIZON COMMUNICATIONS         COM              92343V104      731    17745 SH       DEFINED 1               17745        0        0
WAL MART STORES INC            COM              931142103      826    17145 SH       DEFINED 1               17145        0        0
WAL MART STORES INC            COM              931142103     6014   125000 SH       SOLE                   125000        0        0
WEIGHT WATCHERS INTL INC NEW   COM              948626106      993    19534 SH       DEFINED 1                   0        0    19534
WHOLE FOODS MKT INC            COM              966837106     3830   100000 SH       SOLE                   100000        0        0
YAMANA GOLD INC                COM              98462Y100     5388   485219 SH       SOLE                   485219        0        0
YM BIOSCIENCES INC             COM              984238105      803   448000 SH       SOLE                   448000        0        0
ZALE CORP NEW                  COM              988858106     2381   100000 SH       SOLE                   100000        0        0