Colias tyche, the Booth's sulphur or pale Arctic clouded yellow, is a butterfly in the Pieridae family. It is found from Baffin Island west along the Hudson Bay and arctic coasts of the Nunavut and Northwest Territories mainland and the southern tier of Arctic Islands to northern Yukon, Alaska, and Eurasia. The wingspan is 28–43 mm. The butterfly flies in June to August depending on the location. The larvae feed on legume species.