| Name | Panel | Born | Died |
|---|---|---|---|
| Robert B. O'Hara | 8 | ||
| J.S. O'Harrow | 65 | ||
| W.H. O'Harrow | 44 | ||
| Robert E O'Hearn | 76 | ||
| Melvin C. O'Hern | 38 | ||
| William T. O'Keeffe | 84 | ||
| James O'Kelly | 73 | ||
| Edward O'Loughlin | 72 | ||
| Bernard W. O'Malley | 96 | ||
| Chas H. O'Malley | 5 | ||
| G.T. O'Malley | 6 | ||
| Edward P. O'Malley, Jr. | 99 | ||
| Archie O'Neal | 49 | ||
| Benjamin H. O'Neal | 39 | ||
| John E. O'Neal | 90 | ||
| Frank D. O'Neill | 40 | ||
| Gilbert W. O'Neill | 82 | ||
| Elbert H. O'Pry | 6 | ||
| S.J. O'Reiley | 18 | ||
| Leland S. O'Reilly | 43 | ||
| Daniel E. O'Riordan | 57 | ||
| Francis J. O'Rourke | 77 | ||
| Peter O'Shanick | 34 | ||
| Orville K. O'Steen | 38 | ||
| Donald R. O'Sullivan | 57 | ||
| Francis J. O'Sullivan | 68 | ||
| James P. O'Toole | 32 | ||
| John A. O'Toole | 97 | ||
| Mark K. O'Toole | 61 | ||
| Charles W. Oakes | 93 | ||
| Charles F. Oakley | 117 | ||
| Ross L. Oakley | 42 | ||
| William H. Oakley | 56 | ||
| Harold D. Oaks | 40 | ||
| Charles L. Oates | 48 | ||
| Arden Z. Oats | 92 | ||
| Duncan F. Obee | 11 | ||
| Durward F. N. Obenchain | 55 | ||
| Forest E. Ober | 99 | ||
| Glen Kratz Oberst | 106 | ||
| Howard T. Oblender | 74 | ||
| Joseph A. Obortuck | 79 | ||
| Johnny Obryan Jr. | 111 | ||
| Louis J. Obus | 57 | ||
| Jessie Ochova | 76 | ||
| Lester Charles Ocker | 78 | ||
| Gorden Wendell Odell | 48 | ||
| James C. Odom | 79 | ||
| Harry Meluin Odren | 66 | ||
| J. Norman Oehler | 54 |