In Canadian folklore, Seelkee (transcribed in English from Halqemeylem, the local indigenous language) is a lake monster reported to have lived in the swamps of what is now Chilliwack, in British Columbia, Canada. Seelkee has been allegedly seen by the Stó:lō, First Nations, people for hundreds of years. The most common description of Seelkee is a 10- to 15-foot-long () sea serpent-like beast with the head of a horse.

Descriptions often portray the creature as snake-like with two heads. Furthermore, the coloration has been described as mostly black with red circular designs. Some of the longhouses in the local Stó:lō villages were defined by large house posts with Seelkee designs accented with red paint. Although some modern longhouses were built with gabled roofs, most Stó:lō longhouses were built similarly to the Xá:ytem Longhouse with a single flat, slanted roof. Acting as the primary summer shelters for the Stó:lō people, entire extended families could live in a longhouse, with the structure capable of being extended as the family expanded.

One of the first Caucasian settlers of the region, Issac Kipp, reportly saw a Seelkee and related that he was told by the local Sto:lo people never to turn your back on the beast. Saying "Don't turn around, if you do you'll be sick."

See also Igopogo, said to live in Lake Simcoe, Ontario Loch Ness Monster Ogopogo, said to live in Okanagan Lake, BC Memphre, said to live in Lake Memphremagog, Quebec List of reported lake monsters Selkie, a similar named creature

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