O
- O'Brien, John R. (13)
- O'Donohue, Daniel A. (1)
- O'Neill, Joseph P. (1)
- Oakley, Phyllis (1)
- Oakley, Robert B., 1931- (1)
- Odell, Harry I. (1)
- Ogden, Richard (1)
- Oleksiw, Dan (1)
- Olmsted, Mary Seymour (2)
- Olom, Louis T. (1)
- Olsen, Arthur Joseph (1)
- Olson, Clinton L. (1)
- Opal, Chester H. (1)
- Oram, Frank (1)
- Osborn, David L. (David Lawrence), 1921-1994 (1)
- Ostermeier, Louise Eleanor (1)
- Ostrander, Nancy (1)
- Otto, Allen W. (1)
- Owen, Henry D. (1)
- Owens, John P. (1)