Mount Sinclair is located nine kilometres (5.6 mi) north of Radium Hot Springs in Kootenay National Park.

The peak is the third-highest point of the Stanford Range which is a subrange of the Canadian Rockies.

Topographic relief is significant with the summit rising over 1,400 metres (4,593 ft) above Sinclair Creek in four kilometres (2.5 mi).

The nearest higher peak is Mount Kindersley 13 kilometres (8.1 mi) to the north-northwest.

[6] The mountain's toponym was officially adopted on March 31, 1924, by the Geographical Names Board of Canada.