UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 13F FORM 13F COVER PAGE Report for the Calendar Year or Quarter Ended: December 31, 2006 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 Cincinnati Casualty Company Address: 6200 South Gilmore Road Fairfield, Ohio 45014 13F File Number: 028-10755 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 the Report on Behalf of Reporting Manager: Name: Kenneth S. Miller Title: Sr. Vice President Phone: (513) 870-2000 Signature, Place and Date of Signing: /s/ Kenneth S. Miller Fairfield, Ohio February 9, 2007 - --------------------- ------------------------------------- ---------------- 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 by other reporting manager(s).) List of other Managers Reporting for this Manager: N/A 1

FORM 13F SUMMARY PAGE Report Summary: Number of Other Included Managers 1 Form 13F Information Table Entry Total 10 Form 13F Information Table Value Total 161,840 (thousands) List of Other Included Managers: No. File No. Name 01 028-10798 Cincinnati Financial Corporation 2

COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 COLUMN 5 COLUMN 6 COLUMN 7 COLUMN 8 - ---------------------------------------------------------------------------------------------------------------------------- VALUE SHRS OR SH/ PUT/ INVESTMENT OTHER VOTING AUTHORITY NAME OF ISSUER TITLE OF CLASS CUSIP [x$1000] PRN AMT PRN CALL DISCRETION MANAGERS SOLE SHARED NONE - ---------------------------------------------------------------------------------------------------------------------------- DUKE ENERGY CORP COMMON 26441C105 6,605 198,900 SH SHARED 01 -- 198,900 -- EXXON MOBIL CORPORATION COMMON 30231G102 39,848 520,000 SH SHARED 01 -- 520,000 -- FIFTH THIRD BANCORP COMMON 316773100 58,120 1,419,979 SH SHARED 01 -- 1,419,979 -- GENERAL ELECTRIC CO COMMON 369604103 930 25,000 SH SHARED 01 -- 25,000 -- GENUINE PARTS CO COMMON 372460105 711 15,000 SH SHARED 01 -- 15,000 -- JOHNSON & JOHNSON COMMON 478160104 1,651 25,000 SH SHARED 01 -- 25,000 -- NATIONAL CITY CORPORATION COMMON 635405103 10,040 274,612 SH SHARED 01 -- 274,612 -- PROCTER & GAMBLE CORPORATION COMMON 742718109 16,068 250,000 SH SHARED 01 -- 250,000 -- WELLS FARGO & CO COMMON 949746101 15,646 440,000 SH SHARED 01 -- 440,000 -- WYETH COMMON 983024100 12,221 240,000 SH SHARED 01 -- 240,000 -- ------- 161,840 ======= 3

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