John J. Sheridan is the lead character in the fictional universe of the science-fiction television series Babylon 5, played by Bruce Boxleitner. For most of the series, he is the commander of the Babylon 5 station; during the series' final season he is the President of the Interstellar Alliance.

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.