Auto, from Greek αὐτο- auto- "self, one's own", may refer to:
- An automobile
- An auto rickshaw
- Short for automatic
- Auto (art), a form of Portuguese dramatic play
- An automatic variable (which may be defined in the C programming language using the "auto" keyword)
- Out (novel), which in Japanese is called auto
- Auto (Mega Man), a character from Mega Man series of games
- AUTO, a fictional robot in and the villain of the 2008 film WALL-E