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 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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 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