Mount Rainey is a 1,983-metre (6,506-foot) summit located in the Coast Mountains of British Columbia, Canada.

[1] This mountain's toponym was officially adopted 4 May 1926 on Geological Survey sheet 193A, and confirmed by the Geographical Names Board of Canada in 1953 to remember Robert "Bob" Rainey, the first locator on this mountain who was killed on his mineral claim near Stewart.

Topographic relief is significant as the summit rises 1,983 metres (6,506 feet) above tidewater of the fjord in 4 kilometres (2.5 miles).

[4] Most weather fronts originate in the Pacific Ocean, and travel east toward the Coast Mountains where they are forced upward by the range (Orographic lift), causing them to drop their moisture in the form of rain or snowfall.

As a result, the Coast Mountains experience high precipitation, especially during the winter months in the form of snowfall.