Babylon 5 is an American science fiction television series created, produced and largely written by J. Michael Straczynski. The show centers on the Babylon 5 space station: a focal point for politics, diplomacy, and conflict during the years 2257–2262. With its prominent use of planned story arcs, the series was often described as a "novel for television".

The pilot film premiered on February 22, 1993. The regular series aired from January 26, 1994, and ran for five full seasons. Due to Warner corporate structure and policy concerning syndication in general, and syndication of properties produced by the defunct PTEN division in particular, the show has been syndicated only briefly, and did not appear on U.S. television from 2003 through 2018 (though it has aired in other countries). In 2018, the show began airing nightly on the Comet TV Sci-Fi Network. The show spawned six television films and a spin-off series, Crusade, which aired in 1999 and ran for 13 episodes. On July 31, 2007, a DVD was released containing two short films about selected characters from the series.

The five seasons of the series each correspond to one fictional sequential year in the period 2258–2262. Each season shares its name with an episode that is central to that season's plot. As the series starts, the Babylon 5 station is welcoming ambassadors from various races in the galaxy. Earth has just barely survived an accidental war with the powerful Minbari, who, despite their superior technology, mysteriously surrendered at the brink of the destruction of the human race.

Some episodes in the second season were aired out of their intended chronological sequence. Straczynski confirmed that in Season 2, "A Race Through Dark Places" should precede "Soul Mates," and that "Knives" should precede "In the Shadow of Z'ha'dum."