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, 2008

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 W. Stecher
Title: Chief Financial Officer
Phone: (513) 870-2000

Signature, Place and Date of Signing:


/s/ Kenneth W. Stecher                    Fairfield, Ohio        May 12, 2008
- ------------------------------------   --------------------   ------------------

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


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                              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   114,537
                                         (thousands)

List of Other Included Managers:

No.   File No.    Name
- ---   ---------   ----
01    028-10798   Cincinnati Financial Corporation


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COLUMN 2 COLUMN 3 COLUMN 4 COLUMN 5 COLUMN 6 COLUMN 7 COLUMN 8 -------- --------- -------- -------------- -------------- -------- ------------------------- TITLE OF FMV SHARES/ SH/ ISSUER CLASS CUSIP (000) PRINCIPAL PRN INVESTMENT DIS OTH MGRS SOLE SHARED NONE - ---------------------------- -------- --------- -------- --------- --- -------------- -------- -------- --------- ---- DUKE ENERGY CORP COMMON 26441C105 3,550 198,900 SH SHARED-OTHER 01 -- 198,900 -- EXXON MOBIL CORPORATION COMMON 30231G102 35,524 420,000 SH SHARED-OTHER 01 -- 420,000 -- FIFTH THIRD BANCORP COMMON 316773100 29,706 1,419,979 SH SHARED-OTHER 01 -- 1,419,979 -- GENERAL ELECTRIC CO COMMON 369604103 925 25,000 SH SHARED-OTHER 01 -- 25,000 -- GENUINE PARTS CO COMMON 372460105 603 15,000 SH SHARED-OTHER 01 -- 15,000 -- JOHNSON & JOHNSON COMMON 478160104 1,622 25,000 SH SHARED-OTHER 01 -- 25,000 -- PROCTER & GAMBLE CORPORATION COMMON 742718109 17,518 250,000 SH SHARED-OTHER 01 -- 250,000 -- SPECTRA ENERGY CORP COMMON 847560109 2,262 99,450 SH SHARED-OTHER 01 -- 99,450 -- WELLS FARGO & CO COMMON 949746101 12,804 440,000 SH SHARED-OTHER 01 -- 440,000 -- WYETH COMMON 983024100 10,022 240,000 SH SHARED-OTHER 01 -- 240,000 -- 114,537
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