Watinoceras is a genus of acanthoceratid ammonite that lived during the early Turonian stage of the Late Cretaceous.

Later the venter may be concave between rows of ventrolateral clavi or rounded with ribs passing over in chevrons.

Derivation is from Neocardioceras, Watinoceras and Mammites gave rise to the other genera in the subfamily Acanthoceratinae.

Older classifications included Watinoceras in the subfamily Mammitinae instead.

The first occurrence of the species Watinoceras devonense marks the beginning of the Turonian.