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 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: 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 1

FORM 13F SUMMARY PAGE Report Summary: Number of Other Included Managers 1 Form 13F Information Table Entry Total 53 Form 13F Information Table Value Total 3,133,785 (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 COLUMN 6 COLUMN 7 COLUMN 8 --------------- --------- --------- -------------- ------------ -------- ------------------------ TITLE OF SHARES/ SH/ INVESTMENT ISSUER CLASS CUSIP FMV (000) PRINCIPAL PRN DIS OTH MGRS SOLE SHARED NONE - ---------------------------- --------------- --------- --------- ---------- --- ------------ -------- -------- ---------- ---- AGL RESOURCES COMMON 001204106 10,372 302,200 SH SHARED-OTHER 01 -- 302,200 -- ALLIANCEBERNSTEIN COMMON 01881G106 129,840 2,048,600 SH SHARED-OTHER 01 -- 2,048,600 -- ALLIED WASTE INDUSTRIES INC CONVERTIBLE DEB 019589AD2 4,621 5,050,000 PRN SHARED-OTHER 01 -- -- -- AMERICAN RIVER BANKSHARES COMMON 029326105 3,305 203,385 SH SHARED-OTHER 01 -- 203,385 -- ARTHUR J GALLAGHER COMMON 363576109 857 36,300 SH SHARED-OTHER 01 -- 36,300 -- BB & T CORP COMMON 054937107 6,053 188,800 SH SHARED-OTHER 01 -- 188,800 -- BOSTON PROPERTIES INC CONVERTIBLE DEB 10112RAK0 5,906 6,250,000 PRN SHARED-OTHER 01 -- -- -- CHESAPEAKE ENERGY CORP CONVERTIBLE PFD 165167842 4,231 36,300 SH SHARED-OTHER 01 -- -- -- CHEVRON CORPORATION COMMON 166764100 84,370 988,400 SH SHARED-OTHER 01 -- 988,400 -- CONOCOPHILLIPS COMMON 20825C104 26,674 350,000 SH SHARED-OTHER 01 -- 350,000 -- DUKE ENERGY CORP COMMON 26441C105 34,733 1,945,800 SH SHARED-OTHER 01 -- 1,945,800 -- EQUITABLE RESOURCES INC COMMON 294549100 35,340 600,000 SH SHARED-OTHER 01 -- 600,000 -- EQUITY RESIDENTIAL CONVERTIBLE DEB 26884AAV5 4,591 4,800,000 PRN SHARED-OTHER 01 -- -- -- EXXON MOBIL CORPORATION COMMON 30231G102 298,973 3,534,800 SH SHARED-OTHER 01 -- 3,534,800 -- FIFTH THIRD BANCORP COMMON 316773100 760,156 36,336,352 SH SHARED-OTHER 01 -- 36,336,352 -- FORTUNE BRANDS INC COMMON 349631101 24,325 350,000 SH SHARED-OTHER 01 -- 350,000 -- GENERAL ELECTRIC CO COMMON 369604103 64,768 1,750,000 SH SHARED-OTHER 01 -- 1,750,000 -- GENUINE PARTS CO COMMON 372460105 41,507 1,032,000 SH SHARED-OTHER 01 -- 1,032,000 -- GLIMCHER REALTY TRUST COMMON 379302102 1,196 100,000 SH SHARED-OTHER 01 -- 100,000 -- HUNTINGTON BANCSHARES INC COMMON 446150104 55,665 5,178,108 SH SHARED-OTHER 01 -- 5,178,108 -- HUTCHINSON TECH CONVERTIBLE DEB 448407AF3 1,947 2,500,000 PRN SHARED-OTHER 01 -- -- -- JOHNSON & JOHNSON COMMON 478160104 156,251 2,408,685 SH SHARED-OTHER 01 -- 2,408,685 -- KENDLE INTL INC CV CONVERTIBLE DEB 48880LAA5 173 150,000 PRN SHARED-OTHER 01 -- -- -- LINCOLN NATIONAL CORP COMMON 534187109 16,945 325,869 SH SHARED-OTHER 01 -- 325,869 -- LINEAR TECHNOLOGY CORP COMMON 535678106 21,661 705,800 SH SHARED-OTHER 01 -- 705,800 -- MEDTRONIC INC COMMON 585055106 27,099 560,250 SH SHARED-OTHER 01 -- 560,250 -- MICROCHIP TECHNOLOGY INC COMMON 595017104 29,130 890,000 SH SHARED-OTHER 01 -- 890,000 -- NEW YORK COMMUNITY BANCORP 6% CV PFD CONVERTIBLE PFD 64944P307 4,499 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 725 39,892 SH SHARED-OTHER 01 -- 39,892 -- OMNICARE INC CONVERTIBLE DEB 681904AL2 4,737 7,150,000 PRN SHARED-OTHER 01 -- -- -- PARTNERRE LTD COMMON G6852T105 2,654 34,784 SH SHARED-OTHER 01 -- 34,784 -- PEABODY ENERGY CORP CONVERTIBLE DEB 704549AG9 2,838 2,500,000 PRN SHARED-OTHER 01 -- -- -- PEPSICO INC COMMON 713448108 55,991 775,500 SH SHARED-OTHER 01 -- 775,500 -- PFIZER INC COMMON 717081103 37,674 1,800,000 SH SHARED-OTHER 01 -- 1,800,000 -- PIEDMONT NATURAL GAS COMMON 720186105 78,412 2,986,000 SH SHARED-OTHER 01 -- 2,986,000 -- PNC FINANCIAL SERVICES GROUP COMMON 693475105 118,682 1,810,000 SH SHARED-OTHER 01 -- 1,810,000 -- PRAXAIR INC COMMON 74005P104 2,106 25,000 SH SHARED-OTHER 01 -- 25,000 -- PROCTER & GAMBLE CORPORATION COMMON 742718109 396,246 5,655,000 SH SHARED-OTHER 01 -- 5,655,000 -- REINSURANCE GROUP OF AMERICA 5.75% PIERS CONVERTIBLE PFD 759351307 7,111 109,400 SH SHARED-OTHER 01 -- -- -- SCIELE PHARMA INC CONVERTIBLE DEB 808627AA1 1,580 1,650,000 PRN SHARED-OTHER 01 -- -- -- SEACOR SMITH INC NOTES CONVERTIBLE DEB 811904AH4 3,780 3,000,000 PRN SHARED-OTHER 01 -- -- -- SIERRA BANCORP COMMON 82620P102 9,187 425,150 SH SHARED-OTHER 01 -- 425,150 -- SPECTRA ENERGY CORP COMMON 847560109 18,721 822,900 SH SHARED-OTHER 01 -- 822,900 -- STERLING BANCSHARES INC COMMON 858907108 4,854 488,300 SH SHARED-OTHER 01 -- 488,300 -- STERLING FINANCIAL CORP COMMON 859319105 4,215 270,000 SH SHARED-OTHER 01 -- 270,000 -- SYSCO CORP COMMON 871829107 203 7,000 SH SHARED-OTHER 01 -- 7,000 -- U S BANCORP COMMON 902973304 181,505 5,608,920 SH SHARED-OTHER 01 -- 5,608,920 -- VORNADO REALTY TRUST CONVERTIBLE DEB 929043AE7 8,256 9,290,000 PRN SHARED-OTHER 01 -- -- -- WACHOVIA CORP COMMON 929903102 65,318 2,419,200 SH SHARED-OTHER 01 -- 2,419,200 -- WELLS FARGO & CO COMMON 949746101 121,202 4,165,000 SH SHARED-OTHER 01 -- 4,165,000 -- WEST PHARMACEUTICAL CONVERTIBLE DEB 955306AA3 4,927 5,200,000 PRN SHARED-OTHER 01 -- -- -- WYETH COMMON 983024100 137,182 3,285,000 SH SHARED-OTHER 01 -- 3,285,000 -- 3,133,785 3

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