Vogtei Rheintal (lit. 'Bailiwick of the Rhine Valley') was a condominium of the Old Swiss Confederacy from the 15th century until 1798.Its territory corresponded to the left banks of the Alpine Rhine between Hoher Kasten and Lake Constance, including the towns of Altstätten and Rheineck.
Vogtei Rheintal is presently part of the canton of St. Gallen, specifically and primarily in the constituency of Rheintal.