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, 2010

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

Signature, Place and Date of Signing:

  /s/ Martin F. Hollenbeck      Fairfield, Ohio         May 7, 2010
  ------------------------      ---------------         -----------

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


FORM 13F SUMMARY PAGE Report Summary: Number of Other Included Managers 1 --------- Form 13F Information Table Entry Total 56 --------- Form 13F Information Table Value Total 1,776,937 --------- (thousands) List of Other Included Managers No. File No. Name 01 028-10798 Cincinnati Financial Corporation

Column 2 Column 3 Column 4 Column 5 Column 6 Column 7 Column 8 Issuer Title of Class Cusip FMV (000) Shares SH Investment Oth Sole Shared None /Principal /PRN Dis Mgrs 3M CO COMMON 88579Y101 34,974 418,500 SH SHARED-OTHER 01 - 418,500 - ABBOTT LABORATORIES COMMON 002824100 60,961 1,157,200 SH SHARED-OTHER 01 - 1,157,200 - AGL RESOURCES INC COMMON 001204106 28,613 740,300 SH SHARED-OTHER 01 - 740,300 - ALLIANCEBERNSTEIN HOLDING LP COMMON 01881G106 62,810 2,048,600 SH SHARED-OTHER 01 - 2,048,600 - ASPEN INSURANCE CONVERTIBLE PFD G05384113 8,712 160,000 SH SHARED-OTHER 01 - - - AT&T INC COMMON 00206R102 25,401 983,000 SH SHARED-OTHER 01 - 983,000 - AUTOMATIC DATA PROCESSING COMMON 053015103 31,351 705,000 SH SHARED-OTHER 01 - 705,000 - BAXTER INTERNATIONAL INC COMMON 071813109 51,798 890,000 SH SHARED-OTHER 01 - 890,000 - BEST BUY CO INC COMMON 086516101 1,012 23,800 SH SHARED-OTHER 01 - 23,800 - BLACKROCK INC COMMON 09247X101 15,417 70,800 SH SHARED-OTHER 01 - 70,800 - BOSTON PROPERTIES INC CONVERTIBLE DEB 10112RAK0 6,227 6,250,000 PRN SHARED-OTHER 01 - - - CHEVRON CORP COMMON 166764100 74,950 988,400 SH SHARED-OTHER 01 - 988,400 - CLOROX COMPANY COMMON 189054109 35,341 550,992 SH SHARED-OTHER 01 - 550,992 - COLGATE-PALMOLIVE CO COMMON 194162103 13,642 160,000 SH SHARED-OTHER 01 - 160,000 - CONOCOPHILLIPS COMMON 20825C104 17,910 350,000 SH SHARED-OTHER 01 - 350,000 - DOVER CORP COMMON 260003108 20,218 432,480 SH SHARED-OTHER 01 - 432,480 - DUKE ENERGY CORP COMMON 26441C105 31,755 1,945,800 SH SHARED-OTHER 01 - 1,945,800 - EMERSON ELECTRIC CO COMMON 291011104 36,285 720,800 SH SHARED-OTHER 01 - 720,800 - EQT CORP COMMON 26884L109 24,600 600,000 SH SHARED-OTHER 01 - 600,000 - EXXON MOBIL CORP COMMON 30231G102 100,202 1,496,000 SH SHARED-OTHER 01 - 1,496,000 - FERRO CORPORATION CV DEB CONVERTIBLE DEB 315405AL4 5,053 5,250,000 PRN SHARED-OTHER 01 - - - FIRST NATIONAL BANCSHARES COMMON 32111B104 252 360,000 SH SHARED-OTHER 01 - 360,000 - GENUINE PARTS CO COMMON 372460105 48,449 1,147,000 SH SHARED-OTHER 01 - 1,147,000 - HONEYWELL INTERNATIONAL INC COMMON 438516106 14,921 329,600 SH SHARED-OTHER 01 - 329,600 - HUNTINGTON BANCSHARES INC CONVERTIBLE PFD 446150401 9,559 9,754 SH SHARED-OTHER 01 - - - INTL BUSINESS MACHINES CORP COMMON 459200101 32,704 255,000 SH SHARED-OTHER 01 - 255,000 - JOHNSON & JOHNSON COMMON 478160104 91,280 1,400,000 SH SHARED-OTHER 01 - 1,400,000 - JP MORGAN CHASE COMMON 46625H100 19,019 425,000 SH SHARED-OTHER 01 - 425,000 - KEYCORP INC. CONVERTIBLE PFD 493267405 3,333 35,000 SH SHARED-OTHER 01 - - - LEGGETT & PLATT INC COMMON 524660107 34,490 1,593,800 SH SHARED-OTHER 01 - 1,593,800 - LIFE POINT HOSPITALS SR SUB NTS CONVERTIBLE DEB 53219LAG4 4,869 5,000,000 PRN SHARED-OTHER 01 - - - LINEAR TECHNOLOGY CORP COMMON 535678106 22,058 780,800 SH SHARED-OTHER 01 - 780,800 - MCDONALD'S CORP COMMON 580135101 36,963 554,000 SH SHARED-OTHER 01 - 554,000 - MEDTRONIC INC COMMON 585055106 34,234 760,250 SH SHARED-OTHER 01 - 760,250 - MERIDIAN BIOSCIENCE INC COMMON 589584101 16,703 820,000 SH SHARED-OTHER 01 - 820,000 - METLIFE INC COMMON 59156R108 71,780 1,656,206 SH SHARED-OTHER 01 - 1,656,206 - MICROCHIP TECHNOLOGY INC COMMON 595017104 30,328 1,077,000 SH SHARED-OTHER 01 - 1,077,000 - MICROSOFT CORP COMMON 594918104 23,951 817,800 SH SHARED-OTHER 01 - 817,800 - NEW YORK COMMUNITY BANCORP CONVERTIBLE PFD 64944P307 4,964 95,000 SH SHARED-OTHER 01 - - - NORTHERN TRUST CORP COMMON 665859104 70,722 1,279,799 SH SHARED-OTHER 01 - 1,279,799 - NUCOR CORP COMMON 670346105 41,260 909,212 SH SHARED-OTHER 01 - 909,212 - OMNICARE INC CONVERTIBLE DEB 681904AL2 6,051 7,150,000 PRN SHARED-OTHER 01 - - - PARTNERRE LTD COMMON G6852T105 2,773 34,784 SH SHARED-OTHER 01 - 34,784 - PAYCHEX INC COMMON 704326107 15,400 501,300 SH SHARED-OTHER 01 - 501,300 - PEPSICO INC COMMON 713448108 82,071 1,240,500 SH SHARED-OTHER 01 - 1,240,500 - PFIZER INC COMMON 717081103 55,493 3,235,725 SH SHARED-OTHER 01 - 3,235,725 - PITNEY BOWES INC COMMON 724479100 28,924 1,183,000 SH SHARED-OTHER 01 - 1,183,000 - PRAXAIR INC COMMON 74005P104 31,297 377,072 SH SHARED-OTHER 01 - 377,072 - PROCTER & GAMBLE CO/THE COMMON 742718109 133,158 2,104,604 SH SHARED-OTHER 01 - 2,104,604 - RICHARDSON ELECTRONICS CONVERTIBLE DEB 763165AD9 1,768 1,768,000 PRN SHARED-OTHER 01 - - - RPM INTERNATIONAL INC COMMON 749685103 32,614 1,528,318 SH SHARED-OTHER 01 - 1,528,318 - SPECTRA ENERGY CORP COMMON 847560109 32,943 1,462,194 SH SHARED-OTHER 01 - 1,462,194 - STAPLES INC COMMON 855030102 12,289 525,000 SH SHARED-OTHER 01 - 525,000 - SYSCO CORP COMMON 871829107 16,432 557,000 SH SHARED-OTHER 01 - 557,000 - VERIZON COMMUNICATIONS INC COMMON 92343V104 22,024 710,000 SH SHARED-OTHER 01 - 710,000 - WEST PHARMACEUTICAL CONVERTIBLE DEB 955306AA3 4,628 5,200,000 PRN SHARED-OTHER 01 - - - 1,776,937

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