Atil (also Átil) is a small town in Atil Municipality in the northwest of the Mexican state of Sonora. The total area is 400.43 km² and the population of the municipality was 734 in 2005, of whom 699 lived in the municipal seat (2000). Neighboring municipalities are Tubutama, Trincheras, Oquitoa, and Altar.
It was founded in 1751 by the Jesuit missionary Jacobo Sedelmayer as a mission with the name of Atil. The first inhabitants were Pima Alto or Nebome Indians, who before conversion had led a nomadic or semi-nomadic life. Atil is one of the smallest municipalities in the state. It is said that its name means "Arrow Point", in the Pima language.