Names
- Ober, Philip, 1902-19823
- Odell, H. F. (Herbert Forrest), 1872-19263
- Oglesby, Roscoe Ralph, 1905-3
- Oklahoma State University3
- Oliver, Robert Shaw, 1847-19353
- Olman, Abe3
- Olson, Nancy, 1928-3
- Omni Associates3
- Orbach, Ron3
- Osceola, Seminole chief, 1804-18383
- Otto Berndt & Son (Chicago, Illinois)3
- Owen, Ethel, 1893-19973
- Owen, Meg Wynn3
- Pacino, Al, 1940-3
- Page, Geraldine3
- Paice, Jill3
- Paige, Janis3
- Paine, Morgan T.3
- Paisley, Clifton3
- Palance, Holly, 1950-3