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