Mislen was a planet located in a yellow dwarf system, in the Delta Quadrant. This inhabited planet was the homeworld of the Mislenites. It was located less than five parsecs from the border of the space occupied by the Swarm. (VOY: "The Swarm") This planet was only mentioned in dialogue. According to Star Trek: Star Charts (p. 86), the USS Voyager visited this planet on stardate 50252.