Euxoa castanea is a species of moth in the family Noctuidae that was first described by J. Donald Lafontaine in 1981.

The wingspan is 35–38 mm. Adults are on wing from July to August. There is one generation per year.

  • Anweiler, G. G. (November 19, 2003). . University of Alberta Museums. E.H. Strickland Entomological Museum.
  • . North American Moth Photographers Group. Mississippi State University.