Grimentz is a village in the district of Sierre in the Swiss canton of Valais. An independent municipality before, it merged on 1 January 2009 with neighboring Ayer, Chandolin, Saint Jean, Saint-Luc and Vissoie to form the municipality of Anniviers.

Grimentz is first mentioned in 1052 as Grimiens. The village was formerly known by its German name Grimensi, however, that name is no longer used.

Lac de Moiry is a reservoir completed 1958. Lac des Autannes is located at an elevation of 2,686 m (8,812 ft). Grimentz lies at 1,620 m (5,310 ft) altitude above sea level. The village lies in the Val d'Anniviers in the Pennine Alps.