| Jeffrey Sinclair | |
|---|---|
| Babylon 5 character | |
 | |
| First appearance | Babylon 5: In the Beginning (chronological) (last airdate), The Gathering (airdate) |
| Last appearance | Babylon 5: The Road Home |
| Portrayed by | Michael O'Hare |
| Voiced by | Paul Guyet (Babylon 5: The Road Home) |
| In-universe information | |
| Species | Human |
| Position | Commander (Season 1), Ambassador to Minbar |
| Home planet | Mars |
| Affiliated with | Earth Alliance, Rangers |
Jeffrey Sinclair is a fictional character on the space opera television series titled Babylon 5. He is the original Commander of the Babylon 5 space station.
Portrayed by the actor Michael O'Hare, the character appeared regularly on the first season of the show and made a number of guest appearances early in season two ("The Coming of Shadows") and returned in season three for a two-part episode ("War Without End").
In the second season, Sinclair was succeeded as space station Commander by John J. Sheridan (portrayed by Bruce Boxleitner.)