Crimson Lake Provincial Park, Nature reserve near Rocky Mountain House, Alberta, Canada

Crimson Lake Provincial Park is a nature reserve that centers on a small lake surrounded by forests of pine and aspen, alongside bog and wetland areas. The landscape spans the eastern foothills of Alberta and brings together multiple ecosystems in one location.

Crimson Lake Provincial Park was established on 22 November 1955, making it one of Alberta's older provincial parks. It covers two separate blocks: the 31.86 km² Crimson Lake area with its 230-hectare lake, and the 256-hectare Twin Lakes area to the southeast. The name comes from a trapper who saw the setting sun colour the lake's surface.

The lake's name comes from the colours a trapper saw at sunset reflected on the water. On the northeast shore stands Pioneer Ranch Camp, a Christian summer camp inside the park. Birdwatchers watch the reeds along the lakeshore for sandhill cranes, boreal owls and northern pygmy-owls.

The park provides 169 camping spots with shower facilities, restrooms, and a boat ramp for those arriving with vehicles or watercraft. More than 20 kilometers of marked trails link different parts of the grounds and suit varying skill levels.

Crimson Lake's name comes from a trapper who saw the setting sun colouring the water's surface. The park also holds Twin Lakes, a separate 256-hectare area southeast of the main lake, where a boardwalk runs along the shore and a 6.5 km hiking trail connects back to Crimson Lake.