Salvelinus willughbii, also known as the Windermere charr or Willoughby's charr, is a cold-water fish in the family Salmonidae. Its binomial species name commemorates Francis Willughby. They are remnants from the end of the last ice-age, landlocked and isolated in various lakes within Cumbria, England. S. willughbii are a subspecies of Arctic charr that inhabit Lake Windermere, Coniston Water, Wast Water, Ennerdale Water, Buttermere, Crummock Water, and Loweswater in The Lake District of Cumbria, England. The species has been listed on the IUCN Red List as Critically Endangered due to increased water temperatures, decreased levels of oxygen, and overfishing within Lake Windermere.

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