Pavilion Lake is a lake in Marble Canyon, British Columbia, Canada. It is located between the towns of Lillooet and Cache Creek (18.3 miles WNW, as the crow flies, from Cache Creek) and lies along BC Highway 99, five and a half highway miles (northeast then southeast) from Pavilion, British Columbia. Part of a karst formation, the lake is most notable for being home to colonies of microbialites, a type of stromatolite, and has become the subject of astrobiology research by NASA, the Canadian Space Agency, and research institutions from around the world. The research falls under the umbrella of the Pavilion Lake Research Project. The lake area and its foreshore were added to Marble Canyon Provincial Park in order to protect its special scientific and heritage values.