Rangeroceras is an extinct orthoceratoid cephalopod genus that lived in what is now western North America during the latter part of the Early Ordovician.

The siphuncular rods, which lie along the lower (ventral) side of the siphuncle interiors show thin, slightly undulating, growth lamellae in vertical longitudinal section, a somewhat unusual feature.

Hook and Flower (1977) originally placed Rangeroceras in the family Baltoceratidae because of the siphunclular rod and thin connecting rings.

Evans (2005) proposed the family Rangeroceratidae for Rangeroceras and a somewhat similar genus Cyclorangeroceras from Great Britain and included them in the Dissidocerida.

Other Tajar story based genera include Tajaroceras, Wardoceras, and Veneficoceras The type, Rangeroceras hintzei came from the Wahwah Limestone in the Ibex area in Western Utah.