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

                                    Form 13F

                              Form 13F COVER PAGE

Report for the Calendar Year or Quarter Ended: March 31, 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     May 04, 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:     153

Form13F Information Table Value Total:     $17,724,379 (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     1443    18845 SH       DEFINED 1               18845        0        0
ABITIBI-CONSOLIDATED INC       COM              003924107    20165  7230732 SH       SOLE                  7230732        0        0
AGNICO EAGLE MINES LTD         COM              008474108     6671   188634 SH       SOLE                   188634        0        0
AGRIUM INC                     COM              008916108     8307   216264 SH       SOLE                   216264        0        0
ALCAN INC                      COM              013716105   123938  2377849 SH       SOLE                  2377849        0        0
ALCOA INC                      COM              013817101      640    18845 SH       DEFINED 1               18845        0        0
ALTRIA GROUP INC               COM              02209S103     1658    18845 SH       DEFINED 1               18845        0        0
AMERICAN EXPRESS CO            COM              025816109     1065    18845 SH       DEFINED 1               18845        0        0
AMERICAN INTL GROUP INC        COM              026874107     1268    18815 SH       DEFINED 1               18815        0        0
ANHEUSER BUSCH COS INC         COM              035229103     3785    75000 SH       SOLE                    75000        0        0
AT&T INC                       COM              00206R102      745    18845 SH       DEFINED 1               18845        0        0
BALLARD PWR SYS INC            COM              05858H104      210    38000 SH       SOLE                    38000        0        0
BANK MONTREAL QUE              COM              063671101  1337089 22142904 SH       SOLE                 22142904        0        0
BANK OF AMERICA CORPORATION    COM              060505104    10204   200000 SH       SOLE                   200000        0        0
BARRICK GOLD CORP              COM              067901108   112127  3930217 SH       SOLE                  3930217        0        0
BAYTEX ENERGY TR               TRUST UNIT       073176109     3821   217100 SH       SOLE                   217100        0        0
BCE INC                        COM NEW          05534B760   982337 34738294 SH       SOLE                 34738294        0        0
BCE INC                        COM NEW          05534B760    18112   640500 SH       SOLE    1              640500        0        0
BEST BUY INC                   COM              086516101     7308   150000 SH       SOLE                   150000        0        0
BIOVAIL CORP                   COM              09067J109     4685   214233 SH       SOLE                   214233        0        0
BOEING CO                      COM              097023105     1679    18845 SH       DEFINED 1               18845        0        0
BRISTOL MYERS SQUIBB CO        COM              110122108     1388    50000 SH       SOLE                    50000        0        0
BROOKFIELD ASSET MGMT INC      CL A LTD VT SH   112585104   635182 12154155 SH       SOLE                 12154155        0        0
BROOKFIELD PPTYS CORP          COM              112900105    34263   842590 SH       SOLE                   842590        0        0
CAE INC                        COM              124765108    18758  1664757 SH       SOLE                  1664757        0        0
CAMECO CORP                    COM              13321L108    40120   979341 SH       SOLE                   979341        0        0
CANADIAN NAT RES LTD           COM              136385101   162223  2938088 SH       SOLE                  2938088        0        0
CANADIAN NATL RY CO            COM              136375102   317366  7196198 SH       SOLE                  7196198        0        0
CANADIAN PAC RY LTD            COM              13645T100    45010   800128 SH       SOLE                   800128        0        0
CANETIC RES TR                 COM              137513107    10354   800188 SH       SOLE                   800188        0        0
CATERPILLAR INC DEL            COM              149123101     1266    18840 SH       DEFINED 1               18840        0        0
CATERPILLAR INC DEL            COM              149123101     1341    20000 SH       SOLE                    20000        0        0
CDN IMPERIAL BK OF COMMERCE    COM              136069101  1282088 14774913 SH       SOLE                 14774913        0        0
CELESTICA INC                  SUB VTG SHS      15101Q108     1888   309149 SH       SOLE                   309149        0        0
CHC HELICOPTER CORP            CL A SUB VTG     12541C203    23732  1170000 SH       SOLE                  1170000        0        0
CHESAPEAKE ENERGY CORP         COM              165167107     7720   250000 SH       SOLE                   250000        0        0
CITIGROUP INC                  COM              172967101    15402   300000 SH       SOLE                   300000        0        0
CITIGROUP INC                  COM              172967101      947    18430 SH       DEFINED 1               18430        0        0
CNOOC LTD                      SPONSORED ADR    126132109     4382    50000 SH       SOLE                    50000        0        0
CNX GAS CORP                   COM              12618H309     2833   100000 SH       SOLE                   100000        0        0
COCA COLA CO                   COM              191216100      907    18845 SH       DEFINED 1               18845        0        0
COCA COLA CO                   COM              191216100    13440   280000 SH       SOLE                   280000        0        0
COGNOS INC                     COM              19244C109     5566   141551 SH       SOLE                   141551        0        0
CONCUR TECHNOLOGIES INC        COM              206708109      257    14709 SH       SOLE                    14709        0        0
CONOCOPHILLIPS                 COM              20825C104     8544   125000 SH       SOLE                   125000        0        0
CONSOL ENERGY INC              COM              20854P109     3913   100000 SH       SOLE                   100000        0        0
CORUS ENTERTAINMENT INC        COM CL B NON VTG 220874101    13026   341433 SH       SOLE                   341433        0        0
COTT CORP QUE                  COM              22163N106     1485   111887 SH       SOLE                   111887        0        0
CUMBERLAND RES LTD             COM              23077R100     7641  1170000 SH       SOLE                  1170000        0        0
CVS CORP                       COM              126650100    11949   350000 SH       SOLE                   350000        0        0
DISNEY WALT CO                 COM DISNEY       254687106      650    18845 SH       DEFINED 1               18845        0        0
DORAL FINL CORP                COM              25811P100      410   250000 SH       SOLE                   250000        0        0
DOW CHEM CO                    COM              260543103     3440    75000 SH       SOLE                    75000        0        0
DU PONT E I DE NEMOURS & CO    COM              263534109      884    17845 SH       DEFINED 1               17845        0        0
ENBRIDGE INC                   COM              29250N105   514143 15762867 SH       SOLE                 15762867        0        0
ENCANA CORP                    COM              292505104   247465  4892519 SH       SOLE                  4892519        0        0
ENERGY METALS CORP             COM              29271B106     1258   105000 SH       SOLE                   105000        0        0
ENERPLUS RES FD                UNIT TR G NEW    29274D604    33233   787892 SH       SOLE                   787892        0        0
ENTERRA ENERGY TR              TR UNIT          29381P102     1235   225000 SH       SOLE                   225000        0        0
EXXON MOBIL CORP               COM              30231G102     1349    17845 SH       DEFINED 1               17845        0        0
EXXON MOBIL CORP               COM              30231G102     5659    75000 SH       SOLE                    75000        0        0
FAIRFAX FINL HLDGS LTD         SUB VTG          303901102    74499   330834 SH       SOLE                   330834        0        0
FORDING CDN COAL TR            TR UNIT          345425102     7648   340427 SH       SOLE                   340427        0        0
GENERAL ELECTRIC CO            COM              369604103     1430    40345 SH       DEFINED 1               40345        0        0
GENERAL MTRS CORP              COM              370442105      548    17845 SH       DEFINED 1               17845        0        0
GENEREX BIOTECHNOLOGY CP DEL   COM              371485103     2326  1360300 SH       SOLE                  1360300        0        0
GOLDCORP INC NEW               COM              380956409    26320  1096681 SH       SOLE                  1096681        0        0
HALLIBURTON CO                 COM              406216101     3174   100000 SH       SOLE                   100000        0        0
HARVEST ENERGY TR              TRUST UNIT       41752X101    11011   445000 SH       SOLE                   445000        0        0
HEWLETT PACKARD CO             COM              428236103     1602    39895 SH       DEFINED 1               39895        0        0
HOME DEPOT INC                 COM              437076102      657    17845 SH       DEFINED 1               17845        0        0
HONEYWELL INTL INC             COM              438516106      824    17845 SH       DEFINED 1               17845        0        0
IMPERIAL OIL LTD               COM NEW          453038408   318194  8583807 SH       SOLE                  8583807        0        0
INTEL CORP                     COM              458140100      342    17845 SH       DEFINED 1               17845        0        0
INTEL CORP                     COM              458140100     5739   300000 SH       SOLE                   300000        0        0
INTERNATIONAL BUSINESS MACHS   COM              459200101     1686    17845 SH       DEFINED 1               17845        0        0
INTEROIL CORP                  COM              460951106     8274   313770 SH       SOLE                   313770        0        0
IPSCO INC                      COM              462622101     9657    73576 SH       SOLE                    73576        0        0
ISHARES TR                     DJ US REAL EST   464287739     3336    39130 SH       SOLE                    39130        0        0
ISHARES TR                     MSCI EAFE IDX    464287465      945    12380 SH       SOLE                    12380        0        0
ISHARES TR                     MSCI EMERG MKT   464287234     1060     9100 SH       SOLE                     9100        0        0
JOHNSON & JOHNSON              COM              478160104     1138    18845 SH       DEFINED 1               18845        0        0
JP MORGAN CHASE & CO           COM              46625H100      914    18845 SH       DEFINED 1               18845        0        0
KINROSS GOLD CORP              COM NO PAR       496902404    12451   901900 SH       SOLE                   901900        0        0
LUNDIN MINING CORP             COM              550372106     4945   444311 SH       SOLE                   444311        0        0
MAGNA INTL INC                 CL A             559222401   268176  3574654 SH       SOLE                  3574654        0        0
MANULIFE FINL CORP             COM              56501R106  1749030 50867241 SH       SOLE                 50867241        0        0
MASTERCARD INC                 CL A             57636Q104     5941    55433 SH       SOLE                    55433        0        0
MCDONALDS CORP                 COM              580135101      851    18845 SH       DEFINED 1               18845        0        0
MDS INC                        COM              55269P302     7588   400949 SH       SOLE                   400949        0        0
MERCK & CO INC                 COM              589331107      834    18845 SH       DEFINED 1               18845        0        0
METHANEX CORP                  COM              59151K108    31199  1399998 SH       SOLE                  1399998        0        0
MI DEVS INC                    CL A SUB VTG     55304X104    35864   959412 SH       SOLE                   959412        0        0
MICROSOFT CORP                 COM              594918104      526    18845 SH       DEFINED 1               18845        0        0
MOLSON COORS BREWING CO        CL B             60871R209     3750    40091 SH       SOLE                    40091        0        0
NEUROCHEM INC                  COM              64125K101     5048   336900 SH       SOLE                   336900        0        0
NEXEN INC                      COM              65334H102    88050  1437526 SH       SOLE                  1437526        0        0
NISOURCE INC                   COM              65473P105     7332   300000 SH       SOLE                   300000        0        0
NORTEL NETWORKS CORP NEW       COM NEW          656568508    16203   676096 SH       SOLE                   676096        0        0
NORTHGATE MINERALS CORP        COM              666416102     2403   681600 SH       SOLE                   681600        0        0
NOVA CHEMICALS CORP            COM              66977W109    54844  1774251 SH       SOLE                  1774251        0        0
NOVELIS INC                    COM              67000X106    20371   459841 SH       SOLE                   459841        0        0
NYSE GROUP INC                 COM              62949W103      891     9500 SH       SOLE                     9500        0        0
OPPENHEIMER HLDGS INC          CL A NON VTG     683797104      275     8336 SH       SOLE                     8336        0        0
ORBITAL SCIENCES CORP          COM              685564106      272    14500 SH       DEFINED 1                   0        0    14500
PATTERSON UTI ENERGY INC       COM              703481101     4488   200000 SH       SOLE                   200000        0        0
PENN WEST ENERGY TR            TR UNIT          707885109    28802   978932 SH       SOLE                   978932        0        0
PERU COPPER INC                COM              715455101      790   192000 SH       SOLE                   192000        0        0
PETRO-CDA                      COM              71644E102   115143  2944501 SH       SOLE                  2944501        0        0
PFIZER INC                     COM              717081103      452    17845 SH       DEFINED 1               17845        0        0
PFIZER INC                     COM              717081103    21471   850000 SH       SOLE                   850000        0        0
PHARMACEUTICAL HLDRS TR        DEPOSITRY RCPT   71712A206     7768   100000 SH       SOLE                   100000        0        0
POPULAR INC                    COM              733174106     2484   150000 SH       SOLE                   150000        0        0
POTASH CORP SASK INC           COM              73755L107    56227   352635 SH       SOLE                   352635        0        0
PRECISION DRILLING TR          TR UNIT          740215108     4923   215560 SH       SOLE                   215560        0        0
PRIMEWEST ENERGY TR            TR UNIT NEW      741930309     1822    92600 SH       SOLE                    92600        0        0
PROCTER & GAMBLE CO            COM              742718109     1196    18895 SH       DEFINED 1               18895        0        0
PROGRESS ENERGY INC            COM              743263105     5498   109000 SH       SOLE                   109000        0        0
PROVIDENT ENERGY TR            TR UNIT          74386K104     5554   513000 SH       SOLE                   513000        0        0
QUEBECOR WORLD INC             COM NON-VTG      748203106     1440   114334 SH       SOLE                   114334        0        0
RESEARCH IN MOTION LTD         COM              760975102    36017   264034 SH       SOLE                   264034        0        0
ROGERS COMMUNICATIONS INC      CL B             775109200    17379   530994 SH       SOLE                   530994        0        0
ROYAL BK CDA MONTREAL QUE      COM              780087102  2832158 56869729 SH       SOLE                 56869729        0        0
SCHERING PLOUGH CORP           COM              806605101     8376   328325 SH       SOLE                   328325        0        0
SHAW COMMUNICATIONS INC        CL B CONV        82028K200    14659   397489 SH       SOLE                   397489        0        0
SILVER WHEATON CORP            COM              828336107      722    76294 SH       SOLE                    76294        0        0
SLM CORP                       COM              78442P106   160745  3930200 SH       SOLE                  3930200        0        0
SMTC CORP                      COM NEW          832682207     1356   469082 SH       SOLE                   469082        0        0
SOURCE INTERLINK COS INC       COM NEW          836151209      403    60035 SH       SOLE                    60035        0        0
SPDR TR                        UNIT SER 1       78462F103     1060     7460 SH       SOLE                     7460        0        0
STORM CAT ENERGY CORP          COM              862168101      695   750000 SH       SOLE                   750000        0        0
SUN LIFE FINL INC              COM              866796105   885027 19456438 SH       SOLE                 19456438        0        0
SUNCOR ENERGY INC              COM              867229106   160243  2106053 SH       SOLE                  2106053        0        0
TALISMAN ENERGY INC            COM              87425E103   413190 23547360 SH       SOLE                 23547360        0        0
TECK COMINCO LTD               CL B             878742204   407149  5840402 SH       SOLE                  5840402        0        0
TELUS CORP                     NON-VTG SHS      87971M202   324754  6507627 SH       SOLE                  6507627        0        0
TEXAS INSTRS INC               COM              882508104     4515   150000 SH       SOLE                   150000        0        0
THOMSON CORP                   COM              884903105   412065  9951282 SH       SOLE                  9951282        0        0
TIM HORTONS INC                COM              88706M103     9006   297020 SH       SOLE                   297020        0        0
TORONTO DOMINION BK ONT        COM NEW          891160509  1913207 31820641 SH       SOLE                 31820641        0        0
TOYOTA MOTOR CORP              SP ADR REP2COM   892331307     2444   268307 SH       SOLE                   268307        0        0
TRANSALTA CORP                 COM              89346D107    50883  2350000 SH       SOLE    1             2350000        0        0
TRANSALTA CORP                 COM              89346D107   138028  6374683 SH       SOLE                  6374683        0        0
TRANSCANADA CORP               COM              89353D107   678468 20426575 SH       SOLE                 20426575        0        0
TRANSCANADA CORP               COM              89353D107    35706  1075000 SH       SOLE    1             1075000        0        0
UNITED TECHNOLOGIES CORP       COM              913017109     1162    17840 SH       DEFINED 1               17840        0        0
VALERO ENERGY CORP NEW         COM              91913Y100    12898   200000 SH       SOLE                   200000        0        0
VERIZON COMMUNICATIONS         COM              92343V104      716    18845 SH       DEFINED 1               18845        0        0
WAL MART STORES INC            COM              931142103      887    18845 SH       DEFINED 1               18845        0        0
WAL MART STORES INC            COM              931142103     5869   125000 SH       SOLE                   125000        0        0
WEIGHT WATCHERS INTL INC NEW   COM              948626106      900    19534 SH       DEFINED 1                   0        0    19534
YAMANA GOLD INC                COM              98462Y100     6774   468593 SH       SOLE                   468593        0        0
YM BIOSCIENCES INC             COM              984238105      718   448000 SH       SOLE                   448000        0        0