The Saastal or the Saas Valley is an alpine valley in the district of Visp, in the eastern part of the Canton of Valais, Switzerland. It is the valley of the river Saaser Vispa. It is separated from the Mattertal to the west by the Mischabel massif. Villages in the valley are, upstream, Eisten, Saas-Balen, Saas-Grund, Saas-Fee and Saas-Almagell.
Until 1893, the municipalities of Almagell, Balen, Fee and Grund were a single parish, with the only church in Grund. Mattmarksee is a reservoir built in the 1960s.