Mount Thor, officially gazetted as Thor Peak (Inuktitut: ᙯᕐᓱᐊᓗᒃ Qaisualuk "huge bedrock" or Kigutinnguaq "tooth-like"), is a mountain with an elevation of 1,675 m (5,495 ft) located in Auyuittuq National Park, on Baffin Island, Nunavut, Canada. The mountain is located 46 km (29 mi) northeast of Pangnirtung and features Earth's greatest vertical drop of 1,200 m (4,100 ft), with the cliff overhanging at an average angle of 15 degrees from vertical. Despite its remoteness, this feature makes the mountain a popular rock climbing site. Camping is allowed, with several designated campsites located throughout the length of Akshayuk Pass. For climbers looking to scale Mount Thor, there is an established campsite a few kilometres north of its base, complete with windbreaks and emergency shelters.

The English naming of the mountain originates from Thor, the Norse thunder god.