Mount Sir Sandford, Mountain summit in Selkirk Mountains, British Columbia, Canada.

Mount Sir Sandford is a summit in the Selkirk Mountains of southeastern British Columbia, reaching 3,519 meters in elevation. It stands as the highest peak in this mountain range with a vertical prominence of 2,707 meters from the nearby saddle point.

Mount Sir Sandford was first climbed in 1912 by a party of four led by Edward W. D. Holway, with Howard Palmer, Edward Feuz Jr. and Rudolph Aemmer. Several attempts had been made in the preceding years before this successful ascent. The peak was named after Sir Sandford Fleming, the Canadian Pacific Railway engineer and inventor (1827–1915).

The peak honours Sir Sandford Fleming (1827–1915), the Canadian engineer and inventor best known for promoting a standard time system and for his work with the Canadian Pacific Railway. The summit's name keeps his memory attached to the Selkirk range he never climbed.

Reaching the summit demands advanced skills in glacier, ice, and rock climbing from anyone attempting it. The climbing season runs from June to September when conditions are most stable and safe.

Mount Sir Sandford ranks as the twelfth highest peak in British Columbia and maintains the tenth highest prominence among 27,097 mountains throughout Canada.