- O'Shaughnessy, Louis1
- O.W. Gray & Son4
- Oakes, Jane Elizabeth1
- Ochsner, Albert H., c.1889-19641
- Ochsner, Fleda Fiske1
- Oglesby, J. T.1
- Okura, Jiro1
- Oliver, Russell Van Buren1
- Oral History of the Principalship (Project)1
- Organ, Elcie Ann, 1838-18871
- Organ, John Henry, 1831-18611
- Organ, William Austin, 1841-18621