Cayoosh Mountain is a 2,561-metre (8,402-foot) mountain summit located in the Cayoosh Range in southwestern British Columbia, Canada. It is situated 22 km (14 mi) east-northeast of Pemberton, 12 km (7 mi) north-northeast of Lillooet Lake, and immediately north of Cayoosh Pass. Its nearest higher peak is Mount Marriott, 5.43 km (3 mi) to the north-northeast. Precipitation runoff from the peak drains into Cayoosh Creek and other tributaries of the Fraser River. The mountain's name was submitted by Karl Ricker, a mountaineer, and was officially adopted on January 23, 1979, by the Geographical Names Board of Canada.