| Folder 51/16 | Oakes, Charles G.. — Mar 31 1965-May 15 1969 |
| Folder 51/17 | Obal, Ferenc (Francis). — Jun 30 1963-Jun 15 1978 |
| Folder 51/18 | Obendorf, C.. — Feb 15 1952 |
| Folder 51/19 | Obermayer, Maximilian. — Dec 16 1972-Jan 22 1958 |
| Folder 51/20 | Obers, Samuel J.. — Aug 23 1939 |
| Folder 51/21 | Obrador, S.. — Feb 24 1944-Apr 26 1946 |
| Folder 51/22 | O'Brien, Charles M.. — Oct 23 1934 |
| Folder 51/23 | O'Brien, Daniel P.. — Jul 8 1932-Jun 18 1938 |
| Folder 51/24 | O'Brien, Eileen. — Jun 17 1953 |
| Folder 51/25 | O'Brien, James H.. — Feb 27 1973-Mar 28 1973 |
| Folder 51/26 | O'Brien, Mary V.. — Apr 30 1941-Oct 14 1941 |
| Folder 51/27 | Obrist, Paul A.. — Nov 10 1962-Feb 16 1971 |
| Folder 51/28 | O'Connor, F. W.. — Apr 16 1928 |
| Folder 51/29 | O'Connor, Robert A.. — Dec 11 1956-Dec 14 1956 |
| Folder 51/30 | Odegard, Ornulv. — Mar 13 1959-Mar 20 1959 |
| Folder 51/31 | O'Donnell, Charles F.. — Mar 15 1967-Apr 1 1967 |
| Folder 51/32 | Offner, Franklin. — May 20 1937-Jun 10 1937 |
| Folder 51/33 | Offutt, George C.. — Oct 15 1968-Apr 7 1977 |
| Folder 51/34 | Ogasawara, F.. — Nov 13 1956 |
| Folder 51/35 | Ogawa, Nobuya. — Feb 11 1958-Nov 7 1964 |
| Folder 51/36 | Ogg, Elizabeth. — Mar 17 1952-Apr 29 1952 |
| Folder 51/37 | Olds, James. — Aug 21 1958-Feb 10 1970 |
| Folder 51/38 | Oliver, Kathleen Mae. — Jan 29 1964 |
| Folder 51/39 | Oliver, L. K.. — Sep 14 1970 |
| Folder 51/40 | Oliver, Merle. — May 15 1961 |
| Folder 51/41 | O'Malley, Betsy. — Dec 6 1974 |
| Folder 51/42 | O'Malley, Cahal. — Dec 18 1961-Dec 13 1966 |
| Folder 51/43 | O'Malley, Etain. — Mar 1 1957 |
| Folder 51/44 | O'Malley, Helen. — Dec 17 1945-1971 |
| Folder 51/45 | Ome, Martin T.. — Nov 21 1968 |
| Folder 51/46 | O'Neil, Desmond. — Jan 18 1949-Feb 10 1949 |
| Folder 51/47 | Opler, Marvin K.. — Mar 16 1956 |
| Folder 51/48 | Oppler, Willie. — Oct 1 1952-Apr 12 1958 |
| Folder 51/49 | Orbeli, Leon A.. — Jun 16 1936-Jan 17 1947 |
| Folder 51/50 | Orne, Martin. — Nov 16 1938 |
| Folder 51/51 | Orrick, Norwood. — Oct 18 1965-Oct 22 1969 |
| Folder 51/52 | Ortlepp, Bernice. — May 13 1954 |
| Folder 51/53 | O'Shea, Patricia. — Jul 28 1966-Aug 16 1966 |
| Folder 51/54 | Osler, S.. — Dec 17 1955 |
| Folder 51/55 | Ossipoff, Alexandra. — Feb 24 1964 |
| Folder 51/56 | Ossenkopp. — Oct 16 1956-Nov 3 1956 |
| Folder 51/57 | Ost, John W.. — Apr 16 1962 |
| Folder 51/58 | Ostrinsky, David. — Feb 5 1956-Apr 28 1964 |
| Folder 51/59 | Ostwald, Peter. — Apr 21 1958 |
| Folder 51/60 | Oswald, L. A.. — May 3 1968-Jul 9 1968 |
| Folder 51/61 | Ott, Douglas E.. — n.d. |
| Folder 51/62 | Otterback, Philip G.. — Apr 10 1945-Sep 10 1945 |
| Folder 51/63 | Oumansky, Constantine. — Jul 23 1937-May 21 1941 |
| Folder 51/64 | Overmier, J. Bruce. — May 24 1968-May 27 1968 |
| Folder 51/65 | Overstreet, Mary. — Mar 21 1962-Mar 30 1962 |
| Folder 51/66 | Overton, Donald A.. — May 6 1966-Nov 20 1968 |
| Folder 51/67 | Overzier, Claus. — Feb 8 1957 |
| Folder 51/68 | Owen, Donna. — Feb 1 1971-Oct 17 1971 |
| Folder 51/69 | Owen, Freya W.. — Mar 15 1961 |
| Folder 51/70 | Owen, Jean. — Nov 22 1974-Nov 29 1974 |
| Folder 51/71 | Owens, Gwinn. — May 10 1955 |
| Folder 51/72 | Owens, Hamilton. — Jun 15 1934-Mar 13 1963 |
| Folder 51/73 | Ozek, Metin. — Oct 17 1957-Jul 16 1958 |