Eacles oslari is a species of butterfly of the Saturniidae family, class Insecta from the kingdom, Animalia  found from the Santa Rita, Patagonia, Atascosa and Huachuca mountains of southern Arizona south into Sonora, Sinaloa and Chihuahua in Mexico with a wingspan 112146 mm. .
Eacles oslari, or Oslar's eacles, is a moth of the family Saturniidae. 
