| Příjmení a jméno | Stát | Datum narození | Datum úmrtí |
|---|
| O'Connor, Bryan Daniel |
USA |
* 1946-09-06 |
|
| O'Leary, Brian Todd |
USA |
* 1940-01-27 |
† 2011-07-28 |
| Ochoa, Ellen Lauri |
USA |
* 1958-05-10 |
|
| Ockels, Wubbo Johannes |
NLD |
* 1946-03-28 |
|
| Odle, Randolph Thomas |
USA |
* 1951-09-08 |
|
| Oefelein, William Anthony |
USA |
* 1965-03-29 |
|
| Olivas, John Daniel |
USA |
* 1966-05-25 |
|
| Olsen, Gregory Hammond |
USA |
* 1945-04-20 |
|
| Omel'čenko, Svetlana Oktjabr'jevna |
RUS |
* 1951-08-20 |
|
| Onishi, Takuya |
JPN |
* 1975 |
|
| Onizuka, Ellison Shoji |
USA |
* 1946-06-24 |
† 1986-01-28 |
| Onufrijenko, Jurij Ivanovič |
RUS |
* 1961-02-06 |
|
| Oswald, Stephen Scott |
USA |
* 1951-06-30 |
|
| Ovčinin, Aleksej Nikolajevič |
RUS |
* 1971-09-28 |
|
| Overmyer, Robert Franklin |
USA |
* 1936-07-14 |
† 1996-03-22 |