| Name | Panel | Born | Died |
|---|---|---|---|
| Charles W. Oakes | 93 | ||
| Mark K. O'toole | 61 | ||
| John A. O'Toole | 97 | ||
| James P. O'Toole | 32 | ||
| Francis J. O'Sullivan | 68 | ||
| Donald R. O'Sullivan | 57 | ||
| Orville K. O'Steen | 38 | ||
| Peter O'Shanick | 34 | ||
| Francis J. O'Rourke | 77 | ||
| Daniel E. O'Riordan | 57 | ||
| Leland S. O'Reilly | 43 | ||
| S.J. O'Reiley | 18 | ||
| Elbert H. O'Pry | 6 | ||
| Gilbert W. O'Neill | 82 | ||
| Frank D. O'Neill | 40 | ||
| John E. O'Neal | 90 | ||
| Benjamin H. O'Neal | 39 | ||
| Archie O'Neal | 49 | ||
| Edward P. O'Malley, Jr. | 99 | ||
| G.T. O'Malley | 6 | ||
| Chas H. O'Malley | 5 | ||
| Bernard W. O'Malley | 96 | ||
| Edward O'Loughlin | 72 | ||
| James O'Kelly | 73 | ||
| James O'Kelly | 79 | ||
| William T. O'Keeffe | 84 | ||
| Melvin C. O'Hern | 38 | ||
| Robert E O'Hearn | 76 | ||
| W.H. O'Harrow | 44 | ||
| J.S. O'Harrow | 65 | ||
| Robert B. O'Hara | 8 | ||
| Reginald A. O'Hara | 25 | ||
| Joseph O'Hara | 68 | ||
| Irvan G. O'Hara | 82 | ||
| Edward T. O'Grady | 81 | ||
| John P. O'Flavhaven | 97 | ||
| Edmund J. O'Fallon | 35 | ||
| Claude C. O'Donnell | 90 | ||
| Charles T. O'Connor Jr | 34 | ||
| Oran P. O'Connor | 92 | ||
| Maurice F. O'Connor | 76 | ||
| Joseph J. O'Connor | 45 | ||
| Edward F. O'Connor | 46 | ||
| Charles F. O'Connor | 80 | ||
| John J. O'Conner | 5 | ||
| Walter W. O'Connell | 56 | ||
| Maurice G. O'Connall | 16 | ||
| Woodrow W. O'Brien | 61 | ||
| William O'Brien | 5 | ||
| Philip T. O'Brien | 56 |