Speyeria mormonia, the Mormon fritillary, is a butterfly of the Nymphalidae family of North America. It is common from northern California to British Columbia and west Saskatchewan, Colorado, and western South Dakota. This butterfly is dark orange coloured with distinct black bars and dots in a zig-zag pattern on the topside. The wing margins are dark with lighter circles then dark crescents. Silvery spots predominate on the yellowish underside. Wingspan ranges from 38–61 mm (1.5–2.4 in). Larva feed on Viola sp.