Catacombs Mountain is a 3,290-metre summit in Jasper National Park's Athabasca River valley in Alberta's Canadian Rockies. Arthur O. Wheeler named it in 1921 after an alcove formation that reminded him of recesses in catacombs. The mountain lies in a subarctic climate marked by cold, snowy winters, mild summers, and temperatures that can drop below -20 °C, with wind chill below -30 °C. Its runoff feeds tributaries of the Athabasca River. Geologically, it consists of sedimentary rock laid down from the Precambrian to the Jurassic in shallow seas, then thrust eastward over younger strata during the Laramide orogeny that helped build the Rocky Mountains.