Cardioceras is an extinct ammonite genus belonging to the family Cardioceratidae.

These fast-moving nektonic carnivores lived during the Jurassic period, Oxfordian age.

[2][3] Shells of Cardioceras species can reach a diameter of 20–25 millimetres (0.79–0.98 in).

[4] The shape is circular, with ribs and a prominent ridge along the dorsal edge.

[5] Fossils of species within this genus have been found in the Jurassic of France, Germany, Poland, Russia, the United Kingdom[1] and Alaska.