Maligne Lake, Glacial lake in Jasper National Park, Alberta, Canada

Maligne Lake is a 22.5 km (14.0 mi) long lake in Jasper National Park, Alberta, reaching a maximum depth of 97 m (318 ft) and sitting at about 1,670 m (5,480 ft) above sea level. Its azure water is bordered by forested slopes and snow-streaked mountains, with a low grassy peninsula extending into the water on the right and a few dark rocks just above the surface near the lower right. The lake is fed and drained by the Maligne River and contains Spirit Island, a small islet.

Samson Beaver, a Stoney man who knew the lake as Chaba Imne ("Beaver Lake"), drew a map of it and the route for explorer Mary Schäffer in 1907. On 8 June 1908 Schäffer, Mollie Adams and guides Billy Warren and Sid Unwin reached the lake and explored it on a raft nicknamed HMS Chaba; Schäffer returned in 1911 to survey it. Henry McLeod had sighted it from high ground in 1875 while scouting for the CPR. In 1927 Colonel Fred Brewster built the Maligne Lake Chalet, and in 1928 Donald "Curly" Phillips built the boathouse and the tour boat Leah.

The lake's name comes from the French word for malignant or wicked, used by Father Pierre-Jean De Smet for the turbulent spring river flowing from it. The Stoney man Samson Beaver knew the lake as Chaba Imne, "Beaver Lake", and in 1907 drew the map that guided Mary Schäffer there. Curly Phillips ran a guiding and fishing business from his 1928 boathouse.

The lake lies 44 km south of Jasper town and is reachable by motor vehicle, including shuttle buses from Jasper. Boat tours to Spirit Island run in the spring-to-autumn season. Parks Canada maintains three canoe-only camping sites at Hidden Cove, Fisherman's Bay and Coronet Creek. The 44 km Skyline Trail starts at the lake; winter activities include cross-country skiing and snowboarding.

Three backcountry camping areas along the shoreline remain accessible only through non-motorized watercraft, preserving the natural environment. Geological surveys show the valley was originally shaped by a significantly larger glacier that retreated around 11000 years ago, leaving the current basin.