 | O'Brien, Muriel J. 4n | (1) |
| O'Connor, George A., 1944- 1n | (2) |
| Oheimb, Rainer A. von. | (1) |
| Olson, David Frederick, | (1) |
| Olson, David P. cn | (1) |
| Olson, Philip G., 1934- 4n | (1) |
| Ormsby, James Paul. | (1) |
| O'Rourke, A. Desmond (Andrew Desmond), 1938- 1n | (1) |
| Orr, Paul H. 4n | (2) |
| Osborn, Howard A. (Howard Arthur), 1925- 4n | (1) |
| Osborn, Larence E. 4n | (1) |
| Osterhoudt, Frank H. (Frank Howard), 1928- 4n | (1) |
| Ostrander, Myron D. | (2) |
| Overheim, Richard K., 1933- 4n | (2) |
| Owens, Charles D., 1921- 4n | (3) |