Cameroceras ("chambered horn") is an extinct genus of endocerid cephalopod which lived in equatorial oceans during the entire Ordovician period.

It was particularly abundant and widespread in the Late Ordovician, inhabiting the shallow tropical seas in and around Laurentia, Baltica and Siberia (equivalent to modern North America, Europe, and Asia).

Like other orthoconic nautiloids, Cameroceras had a narrow conical shell with smooth, simple sutures dividing a series of septa (internal chambers).

Cameroceras has historically been utilized as a "wastebasket taxon" in which species of large orthoconic endocerids such as Endoceras, Vaginoceras, and Meniscoceras were originally placed.

The type species Cameroceras trentonense was named by Conrad in 1842, based on fossils from the Trenton Limestone of western New York state.

Sardeson (1925/1930) suggested that Cameroceras and Endoceras are potentially different growth stages of the same genus,[9][10] though other authors have doubted this perspective.

[11][9][10][1] Cameroceras' vague early descriptions have led other authors to prefer Endoceras or other better-described genera when the nomenclature is in question.