Kosmoceratidae is an extinct ammonite family from the Callovian (Middle Jurassic) to Early Cretaceous.

Kosmoceratidae are probably the most polymorphic groups of Jurassic ammonites.

These ammonoids have a more or less tabulate venter, with lateral or ventrolateral tubercles.

The aptychus is double valved with a concentrically ribbed surface.

This Ammonitina-related article is a stub.