O
| Year | Nominee | Film |
|---|---|---|
| 1954 | Edmond O'Brien | The Barefoot Contessa |
| 1964 | Edmond O'Brien (2) | Seven Days in May |
| 1955 | Arthur O'Connell | Picnic |
| 1959 | Arthur O'Connell (2) | Anatomy of a Murder |
| 1980 | Michael O'Keefe | The Great Santini |
| 1940 | Jack Oakie | The Great Dictator |
| 1976 | Laurence Olivier | Marathon Man |
| 1999 | Haley Joel Osment | The Sixth Sense |
| 2004 | Clive Owen | Closer |
Read more about this topic: List Of Nominees For The Academy Award For Best Supporting Actor (by Actor)