Peyto Lake (pea-toe) is a glacier fed lake located in Banff National Park in the Canadian Rockies. The lake itself is easily accessed from the Icefields Parkway at Bow Summit, about 30 minutes north of Lake Louise.

During the summer, significant amounts of glacial rock flour flow into the lake, and these suspended rock particles give the lake a bright, turquoise color. Because of its bright color, photos of the lake often appear in illustrated books, and area around the lake is a popular sightseeing spot for tourists in the park.