A rogue star is a star that has escaped the gravitational pull of its host galaxy and is moving freely in, or toward, the intergalactic void. A star that has acquired a sufficiently high velocity to break free from the galaxy in which it formed is called a hypervelocity star. Several such stars have been found in our own Milky Way Galaxy.

More generally, a rogue star is any star that is in an unusual location or state of motion.