Eulytoceras is an extinct genus of ammonoid cephalopods belonging to the family Lytoceratidae. These fast-moving nektonic carnivores lived in the Cretaceous period, from Hauterivian age to Barremian age.
Shells of Eulytoceras species reach a diameter of about .
Fossils of species within this genus have been found in the Cretaceous rocks of Antarctica, Austria, Canada, Italy, Madagascar, South Africa and Spain.