In Canadian folklore, the Igopogo is a mythical creature said to dwell in Lake Simcoe, Ontario.^[1] The creature's name is ostensibly based on the Ogopogo, of Lake Okanagan, British Columbia, and also the title of the 1952 book I Go Pogo, a slogan often mentioned in the comic.^[2] Other nicknames for the Igopogo include Beaverton Bessie, after Beaverton, Ontario, and "Kempenfelt Kelly" after the bay that extends from the lake into the city of Barrie, Ontario.^[3] The city of Barrie erected a sculpture of the Igopogo at the waterfront.

E. J. Delaney, described it as a creature with two long antennae, four octopus-like arms, three pairs of legs, and six gill-like appendages with feathers.^[1]

Some writers have speculated based on this appearance that the sightings were actually of pinnipeds, such as otters or seals.^[1][3]

David Soules, an early settler, is credited with the first alleged Igopogo sighting in 1823. While tending sheep, Soules reportedly saw a long creature leaving a wake in the water and a trail in the mud. Another major sighting took place in 1952 by four witnesses including Wellington Charles, chief of the Georgina Island First Nation.^[1] In 1983, sonar operator William W. Skrypetz reported spotting a large animal with a long neck,^[1] although some have disputed this account, claiming the reading could have instead been a school of fish.^[3]

Other alleged sightings include reports in 1903 and 1906, and a 1991 video recording of "a large, seal-like animal."^[3] In 2016 John Kirk of the British Columbia Scientific Cryptozoology Club claimed on The Shirley Show to have a tape of the creature, though he did not show it.^[2]

• Ogopogo, reported to live in Okanagan Lake, in British Columbia, Canada
• Manipogo, said to live in Lake Manitoba, Manitoba
• Memphre, said to live in Lake Memphremagog, Quebec
• Seelkee, said to live in the swamps of what is now Chilliwack, in British Columbia