Euxoa muldersi is a moth of the Noctuidae family. It is known only from north central Canada with all specimens except two from the vicinity of Arviat, Nunavut. It is restricted to open dunes where it flies close to the sand. The species must use a similar pheromone to Euxoa churchillensis because males ofE. churchillensis were observed being attracted to calling E. muldersi females, although no attempts at mating were observed.