The Wahlkreis Rheintal (English: Rhine Valley) is a constituency (Wahlkreis) of the canton of St. Gallen, Switzerland, formed under the new constitution of the canton on 10 June 2001. It consists largely of the former districts of Oberrheintal and Unterrheintal.

The Wahlrkreis covers almost all the region of Vogtei Rheintal and later Rheintal District.

Rheintal has a population of 74,372 (as of 31 December 2020). Of the foreign population, (as of 2000), 1,118 are from Germany, 1,978 are from Italy, 6,222 are from ex-Yugoslavia, 1,684 are from Austria, 850 are from Turkey, and 1,925 are from another country.