The Loser Bar is a bar located on Mars.
Jet Black and Spike Spiegel come to the bar to drown their sorrows after Faye Valentine and Edward left the crew. Unbeknownst to them, the leaders of the Red Dragon crime syndicate had sent a team to kill Spike through his connection to Vicious, and they found him in the bar. At the same time, Shin followed that team in order to help out Spike. They all converged on the bar, but Jet and Spike noticed them coming. Jet suffered a shot in the leg, but, with Shin's help, they escaped.