Conthey (French pronunciation: [kɔ̃tɛ]) is a municipality in the district of Conthey in the canton of Valais in Switzerland .

Conthey is first mentioned about 800 as curtis Contextis. In 1146 it was mentioned as ecclesiam de Plano Contesio.

Conthey has an area, as of 2009, of 85 square kilometers (33 sq mi). Of this area, 19.81 km2 (7.65 sq mi) or 23.3% is used for agricultural purposes, while 22.39 km2 (8.64 sq mi) or 26.3% is forested. Of the rest of the land, 4.29 km2 (1.66 sq mi) or 5.0% is settled (buildings or roads), 0.75 km2 (0.29 sq mi) or 0.9% is either rivers or lakes and 37.85 km2 (14.61 sq mi) or 44.5% is unproductive land.