Diademodontidae is an extinct family of Triassic gomphodonts.

The best-known genus is Diademodon from South Africa.

Titanogomphodon from Namibia may also be a member of Diademodontidae.

[1] The Chinese genera Hazhenia and Ordosiodon have also been included in the family, but were more recently identified as baurioid therocephalians.

[2] Remains of a diademodontid were reported in the Early-Middle Triassic Fremouw Formation in Antarctica,[3] but that specimen was later referred to the trirachodontid Impidens.