Surnames Beginning with "O"
| Surname | First/Middle | Residence | Birthday | Birthplace |
| Oakes | Malcom Christie | Norman | 25 Jun 1890 | Hugo, OK |
| Oakley | John | Noble | 20 Mar 1896 | Exter, MO |
| O'Brien | Pat | |||
| Odom | George Elmer | Lexington | 19 Jan 1889 | |
| Odom | Jessie Alexander | Noble | 15 Jul 1880 | |
| Odor | Charles Major | Norman | 19 Sep 1888 | Kerney, MO |
| Offenburger | Fred Thomas | Norman | 31 Jul 1899 | |
| Ogwin | James Walter | Norman | 12 March 1900 | |
| Ohaver | Claude D. | Norman | 14 Sep 1896 | Norman, OK |
| OHaver | Delbert N. | Norman | 17 Nov 1889 | TX |
| Ohls | Will Own | Moore | 11 Aug 1897 | Scottville, KS |
| Okeefe | Elmer Lea | Norman | 25 May 1893 | Fort Scott, KS |
| Okeefe | James Robert Patrick | Norman | 26 May 1896 | Fort Scott, KS |
| OKeefe | Mark Cleo | Norman | 4 Jul 1896 | Norman, OK |
| Okeefe | Richard Anderson | Norman | 27 Apr 1891 | Norman, OK |
| Oliphant | Burton Otis | Norman | 15 Nov 1899 | |
| Oliphant | Claude Waite | Norman | 26 Nov 1896 | Pauls Valley, OK |
| Oliphant | Guy A. | Noble | 2 Jul 1890 | AR |
| Oliphant | Howard Z. | Norman | 26 Aug 1891 | Clarksville, AR |
| Oliphant | Luther D. | Norman | 6 Nov 1881 | |
| Oliphant | Thomas E. | Norman | 28 Aug 1880 | |
| Oliver | Charlie Bryan | Lexington | 27 Nov 1896 | Trinton, TX |
| Oliver | William Samuel | Norman | 18 Sep 1893 | Seymour, MO |
| Olson | Joh Oly | Lexington | 14 Mar 1896 | Jewell, IA |
| Olson | Victor | Lexington | 16 Oct 1899 | |
| O'Neal | W.T. | Bryan | 8 Jan 1883 | |
| Orr | J. Roy | Norman | 6 May 1892 | Rosemond, IL |
| Osborn | Early | Newalla | 15 Oct 1896 | Newalla, OK |
| Osborn | George Britton | Oklahoma | 25 Oct 1873 | |
| Osborn | Julian Almas | Newalla | 27 Aug 1898 | |
| Osborn | Mike Lewis | Newalla | 25 Jul 1894 | |
| Osborn | William Alexander | Newalla | 12 Jan 1890 | |
| Osterhaus | Egon Joseph | Norman | 6 Jan 1884 | |
| Osterhaus | Fred John | Norman | 16 Mar 1890 | Ellinwood, KS |
| Osterhaus | Theodore J. | Norman | 14 Jul 1889 | Ellenwood, KS |
| Oswalt | Charlie E. | Trousdale | 13 May 1896 | El Reno, OK |
| Ottinger | Albert B. | Parrotsville | 25 Apr 1894 | Parrottsville, TN |
| Outhouse | Edward Homer | Lexington | 24 Mar 1882 | |
| Owen | Benjamin Gilbert | Norman | 24 Jul 1876 | |
| Owens | Charles Albert | Lexington | 25 Feb 1873 | |
| Owens | Corbett J. | Lexington | 23 May 1898 | Parton, AL |
| Owens | James Abner | Lexington | 31 Jul 1898 | |
| Owens | Thomas C. | Trousdale | 4 Jan 1885 | |
| Owens | Van | Logan County | 1880 | |
| Owens | William | Tribbey | 21 Apr 1899 | AR |
| Ownbey | Benjamin Warren | Newalla | 19 Apr 1876 | |
| Owwen | John | Noble | 29 Jan 1892 | Noble, OK |