Ali Oidak or Alioitak is a populated place located in the Gu Achi District of the Papago Indian Reservation in Pima County, Arizona, United States. It has an estimated elevation of 1824 ft above sea level. The place name means "little field" in the O'odham or Papago language. A 1969 study of Papago communities lists it as a village with a single field well, supporting six houses.