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, 2012

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:    Martin F. Hollenbeck
Title:   Chief Investment Officer
Phone:   (513) 870-2000

Signature, Place and Date of Signing:

/s/ Martin F. Hollenbeck           Fairfield, Ohio           May 4, 2012
------------------------           ---------------           -----------


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 23 ------ Form 13F Information Table Value Total 66,632 ------ (thousands) List of Other Included Managers: No. File No. Name 01 028-10798 Cincinnati Financial Corporation 2

Column 2 Column 3 Column 4 Column 5 Issuer Title of Class Cusip FMV (000) Shares/Principal SH/PRN AUTOMATIC DATA PROCESSING COMMON 053015103 3,974 72,000 SH BLACKROCK INC COMMON 09247X101 2,049 10,000 SH DOVER CORP COMMON 260003108 5,665 90,000 SH DUKE ENERGY CORP COMMON 26441C105 4,179 198,900 SH EMERSON ELECTRIC CO COMMON 291011104 4,696 90,000 SH GENERAL MILLS INC COMMON 370334104 3,235 82,000 SH GENUINE PARTS CO COMMON 372460105 941 15,000 SH HASBRO INC COMMON 418056107 1,561 42,500 SH HONEYWELL INTERNATIONAL INC COMMON 438516106 3,053 50,000 SH INTEL CORP COMMON 458140100 1,181 42,000 SH JOHNSON & JOHNSON COMMON 478160104 1,649 25,000 SH JP MORGAN CHASE COMMON 46625H100 2,138 46,500 SH LEGGETT & PLATT INC COMMON 524660107 1,093 47,500 SH LINEAR TECHNOLOGY CORP COMMON 535678106 1,213 36,000 SH MICROCHIP TECHNOLOGY INC COMMON 595017104 1,376 37,000 SH MICROSOFT CORP COMMON 594918104 2,580 80,000 SH NUCOR CORP COMMON 670346105 966 22,500 SH PFIZER INC COMMON 717081103 5,353 236,400 SH PRAXAIR INC COMMON 74005P104 2,866 25,000 SH SPECTRA ENERGY CORP COMMON 847560109 9,921 314,450 SH UNITED TECHNOLOGIES CORP COMMON 913017109 3,318 40,000 SH US BANCORP COMMON 902973304 2,534 80,000 SH WISCONSIN ENERGY CORP COMMON 976657106 1,091 31,000 SH 66,632 Column 6 Column 7 Column 8 Issuer Investment Dis Oth Mgrs Sole Shared None AUTOMATIC DATA PROCESSING SHARED-OTHER 01 - 72,000 - BLACKROCK INC SHARED-OTHER 01 - 10,000 - DOVER CORP SHARED-OTHER 01 - 90,000 - DUKE ENERGY CORP SHARED-OTHER 01 - 198,900 - EMERSON ELECTRIC CO SHARED-OTHER 01 - 90,000 - GENERAL MILLS INC SHARED-OTHER 01 - 82,000 - GENUINE PARTS CO SHARED-OTHER 01 - 15,000 - HASBRO INC SHARED-OTHER 01 - 42,500 - HONEYWELL INTERNATIONAL INC SHARED-OTHER 01 - 50,000 - INTEL CORP SHARED-OTHER 01 - 42,000 - JOHNSON & JOHNSON SHARED-OTHER 01 - 25,000 - JP MORGAN CHASE SHARED-OTHER 01 - 46,500 - LEGGETT & PLATT INC SHARED-OTHER 01 - 47,500 - LINEAR TECHNOLOGY CORP SHARED-OTHER 01 - 36,000 - MICROCHIP TECHNOLOGY INC SHARED-OTHER 01 - 37,000 - MICROSOFT CORP SHARED-OTHER 01 - 80,000 - NUCOR CORP SHARED-OTHER 01 - 22,500 - PFIZER INC SHARED-OTHER 01 - 236,400 - PRAXAIR INC SHARED-OTHER 01 - 25,000 - SPECTRA ENERGY CORP SHARED-OTHER 01 - 314,450 - UNITED TECHNOLOGIES CORP SHARED-OTHER 01 - 40,000 - US BANCORP SHARED-OTHER 01 - 80,000 - WISCONSIN ENERGY CORP SHARED-OTHER 01 - 31,000 - 3

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