O
- O’Dell, Henry Augustus
- O’Dell, William
- O’Donnell, James
- O’Donoghue, Sylvester
- O’Gara, James Joseph
- O’Gorman, Peter James
- O’Leary, Frederick James
- Oakley, Frank Page
- Oakley, William
- Ockleshaw, Frederick
- Ogilvie, Andrew Linton
- Ogilvie, Robert Mitchell
- Ogilvy, David
- Okill, John Leigh
- Oldershaw, Charles Russell
- Oliver, Frederick George
- Orff, Fremont Dayton
- Orr, Robert Thomas
- Orr, Roland Guerney
- Orrock, John Wilson
- Osborne, Edward P.
- Osborne, Milton Smith
- Osgood, Sidney J.
- Ostell, John
- Otis, Calvin Nicholas
- Ouellet, David
- Ouellet, Joseph Pierre
- Ouellette, Joseph Albert
- Ough, Richard
- Ouimet, Georges
- Over, Walter Percy
- Owen, Frank Ifor Moran
- Owen, Henry Ernest Lloyd
- Owen, William Arthur
- Owens, Henry
- Owens, William Hyacinth
- Oxley, James Morrow
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