Speyeria hesperis, the northwestern fritillary, is a butterfly of the family Nymphalidae.

It is found in the northwestern United States and western Canada, as far east as Manitoba and the Dakotas.

[1][2] With a wingspan of between 45–58 millimetres (1.8–2.3 in), this fritillary is relatively small.

It has bright orange uppersides (yellow in females) and thinner black markings than most fritillaries.

This Heliconiinae article is a stub.