Mount Lefroy is a mountain on the Continental Divide, at the border of Alberta and British Columbia in western Canada.

The mountain is located on the eastern side of Abbot Pass which separates Lake Louise in Banff National Park from Lake O'Hara in Yoho National Park.

Mount Victoria lies immediately on the western side of the pass.

The mountain was named by George M. Dawson in 1894 for Sir John Henry Lefroy (1817–1890), an astronomer who had travelled over 8,800 kilometres (5,470 mi) in Canada's north between 1842 and 1844 making meteorological and magnetic observations.

[5] Mount Lefroy is composed of sedimentary rock laid down during the Cambrian period.