Placenticeratidae is an extinct family of mostly Late Cretaceous ammonites (cephalopod order Ammonitida) included in the superfamily Hoplitoidea, derived from the Engonoceratidae by an increase in suture complexity.

Placeticeratids are characterized by rather involute compressed shells of moderate to large size with narrow flat or grooved venters (outer rims), at least on early whorls.

Most are rather smooth or weakly ornamented except for a few later forms in which the outer whorls are strongly tuberculate.

The Placenticeratidae had their beginning in the Late Albian stage at the end of the Early Cretaceous, starting with Hypengonoceras.

The family has the longest duration of the Hoplitaceae, extending well into the Maastrichtian, the final stage of the Cretaceous period with the genus Hoplitoplacenticeras.