Hyalophora euryalus, the ceanothus silkmoth, is a moth of the family Saturniidae.

It is found in the dry intermontane valleys and interior of British Columbia, Canada, (as far north as Prince George along the Fraser River) south to Baja California in Mexico.

Adults are on wing from January to July depending on the location.

The larvae feed on Ceanothus, Rhamnus californica, Prunus emarginata, Arctostaphylos, Alnus, Betula, Corylus, Ribes, Pseudotsuga menziesii, Arbutus menziesii, Liquidambar and Salix.

This article on a moth of the family Saturniidae is a stub.