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

                                    FORM 13F

                               FORM 13F COVER PAGE

Report for the Calendar Year or Quarter Ended: June 30, 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 Insurance Company
Address: 6200 South Gilmore Road
         Fairfield, Ohio 45014

13F File Number: 028-10753

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: President and Chief Executive Officer
Phone: (513) 870-2000

Signature, Place and Date of Signing:


/s/ Kenneth W. Stecher                  Fairfield, Ohio   August 8, 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           49

Form 13F Information Table Value Total    2,508,511
                                         (thousands)
List of Other Included Managers

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


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COLUMN 5 COLUMN 2 COLUMN 3 COLUMN 4 SHARES/ SH/ COLUMN 6 COLUMN 7 COLUMN 8 ISSUER TITLE OF CLASS CUSIP FMV (000) PRINCIPAL PRN INVESTMENT DIS OTH MGRS SOLE SHARED NONE - ------ --------------- --------- --------- ---------- --- -------------- -------- -------- ---------- ---- AGL RESOURCES COMMON 001204106 13,908 402,200 SH SHARED-OTHER 01 -- 402,200 -- ALLIANCEBERNSTEIN COMMON 01881G106 112,017 2,048,600 SH SHARED-OTHER 01 -- 2,048,600 -- ALLIED WASTE INDUSTRIES INC CONVERTIBLE DEB 019589AD2 4,798 5,050,000 PRN SHARED-OTHER 01 -- -- -- AMERICAN RIVER BANKSHARES COMMON 029326105 1,941 196,885 SH SHARED-OTHER 01 -- 196,885 -- ARTHUR J GALLAGHER COMMON 363576109 875 36,300 SH SHARED-OTHER 01 -- 36,300 -- BB & T CORP COMMON 054937107 4,299 188,800 SH SHARED-OTHER 01 -- 188,800 -- BOSTON PROPERTIES INC CONVERTIBLE DEB 10112RAK0 5,766 6,250,000 PRN SHARED-OTHER 01 -- -- -- CHESAPEAKE ENERGY CORP CONVERTIBLE PFD 165167842 5,844 36,300 SH SHARED-OTHER 01 -- -- -- CHEVRON CORPORATION COMMON 166764100 97,980 988,400 SH SHARED-OTHER 01 -- 988,400 -- CONOCOPHILLIPS COMMON 20825C104 33,037 350,000 SH SHARED-OTHER 01 -- 350,000 -- DUKE ENERGY CORP COMMON 26441C105 33,818 1,945,800 SH SHARED-OTHER 01 -- 1,945,800 -- EQUITABLE RESOURCES INC COMMON 294549100 41,436 600,000 SH SHARED-OTHER 01 -- 600,000 -- EQUITY RESIDENTIAL CONVERTIBLE DEB 26884AAV5 4,541 4,800,000 PRN SHARED-OTHER 01 -- -- -- EXXON MOBIL CORPORATION COMMON 30231G102 269,220 3,054,800 SH SHARED-OTHER 01 -- 3,054,800 -- FIFTH THIRD BANCORP COMMON 316773100 369,904 36,336,352 SH SHARED-OTHER 01 -- 36,336,352 -- FORTUNE BRANDS INC COMMON 349631101 21,844 350,000 SH SHARED-OTHER 01 -- 350,000 -- GENERAL ELECTRIC CO COMMON 369604103 46,708 1,750,000 SH SHARED-OTHER 01 -- 1,750,000 -- GENUINE PARTS CO COMMON 372460105 40,950 1,032,000 SH SHARED-OTHER 01 -- 1,032,000 -- GLIMCHER REALTY TRUST COMMON 379302102 1,118 100,000 SH SHARED-OTHER 01 -- 100,000 -- HUNTINGTON BANCSHARES INC CONVERTIBLE PFD 446150401 21,700 31,000 SH SHARED-OTHER 01 -- -- -- HUTCHINSON TECH CONVERTIBLE DEB 448407AF3 1,825 2,500,000 PRN SHARED-OTHER 01 -- -- -- JOHNSON & JOHNSON COMMON 478160104 154,975 2,408,685 SH SHARED-OTHER 01 -- 2,408,685 -- KENDLE INTL INC CV CONVERTIBLE DEB 48880LAA5 154 150,000 PRN SHARED-OTHER 01 -- -- -- LINCOLN NATIONAL CORP COMMON 534187109 14,768 325,869 SH SHARED-OTHER 01 -- 325,869 -- LINEAR TECHNOLOGY CORP COMMON 535678106 22,988 705,800 SH SHARED-OTHER 01 -- 705,800 -- MEDTRONIC INC COMMON 585055106 28,993 560,250 SH SHARED-OTHER 01 -- 560,250 -- MICROCHIP TECHNOLOGY INC COMMON 595017104 27,181 890,000 SH SHARED-OTHER 01 -- 890,000 -- NEW YORK COMMUNITY BANCORP 6% CV TR PFD CONVERTIBLE PFD 64944P307 4,513 95,000 SH SHARED-OTHER 01 -- -- -- NORAM ENERGY CORP CV DEB CONVERTIBLE DEB 655419AC3 10,493 10,652,650 PRN SHARED-OTHER 01 -- -- -- NORTHRIM BANCORP COMMON 666762109 603 33,190 SH SHARED-OTHER 01 -- 33,190 -- OMNICARE INC CONVERTIBLE DEB 681904AL2 5,345 7,150,000 PRN SHARED-OTHER 01 -- -- -- PARTNERRE LTD COMMON G6852T105 2,405 34,784 SH SHARED-OTHER 01 -- 34,784 -- PEPSICO INC COMMON 713448108 49,314 775,500 SH SHARED-OTHER 01 -- 775,500 -- PFIZER INC COMMON 717081103 31,446 1,800,000 SH SHARED-OTHER 01 -- 1,800,000 -- PIEDMONT NATURAL GAS COMMON 720186105 78,114 2,986,000 SH SHARED-OTHER 01 -- 2,986,000 -- PNC FINANCIAL SERVICES GROUP COMMON 693475105 103,351 1,810,000 SH SHARED-OTHER 01 -- 1,810,000 -- PRAXAIR INC COMMON 74005P104 2,356 25,000 SH SHARED-OTHER 01 -- 25,000 -- PROCTER & GAMBLE CORPORATION COMMON 742718109 343,881 5,655,000 SH SHARED-OTHER 01 -- 5,655,000 -- REINSURANCE GROUP OF AMERICA 5.75% PIERS CONVERTIBLE PFD 759351307 5,908 109,400 SH SHARED-OTHER 01 -- -- -- SCIELE PHARMA INC CONVERTIBLE DEB 808627AA1 1,504 1,650,000 PRN SHARED-OTHER 01 -- -- -- SEACOR SMITH INC NOTES CONVERTIBLE DEB 811904AH4 3,874 3,000,000 PRN SHARED-OTHER 01 -- -- -- SIERRA BANCORP COMMON 82620P102 6,385 386,950 SH SHARED-OTHER 01 -- 386,950 -- SPECTRA ENERGY CORP COMMON 847560109 23,650 822,900 SH SHARED-OTHER 01 -- 822,900 -- U S BANCORP COMMON 902973304 156,433 5,608,920 SH SHARED-OTHER 01 -- 5,608,920 -- VORNADO REALTY TRUST CONVERTIBLE DEB 929043AE7 8,570 9,290,000 PRN SHARED-OTHER 01 -- -- -- WACHOVIA CORP CONVERTIBLE PFD 929903219 26,441 30,000 SH SHARED-OTHER 01 -- -- -- WELLS FARGO & CO COMMON 949746101 98,919 4,165,000 SH SHARED-OTHER 01 -- 4,165,000 -- WEST PHARMACEUTICAL CONVERTIBLE DEB 955306AA3 4,875 5,200,000 PRN SHARED-OTHER 01 -- -- -- WYETH COMMON 983024100 157,549 3,285,000 SH SHARED-OTHER 01 -- 3,285,000 -- 2,508,511
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