| Husband | Wife | Date | Location |
| Ostiguy, Leonard | Angele Harvey | ABT. 1912 | Massachusetts |
| Otis, Jean | Therese Grenon | date unknown | location unknown |
| Otis, Roger | Angel Fortin | date unknown | location unknown |
| Ouellet, Jean | Marie Charest | date unknown | location unknown |
| Ouellete, Charles | Edee Harvey | 12 JAN 1885 | St. Simeon, Charlevoix, Québec (EG Talbot) |
| Ouellette, Magloire | Henriette Philibert | date unknown | location unknown |