Cyamodontoidea is an extinct superfamily of placodont marine reptiles from the Triassic period.

Cyamodontoids also have distinctive skulls with narrow, often toothless jaws and wide, flaring temporal regions behind the eyes.

Two large temporal openings are positioned at the top of the back of the skull, an arrangement that is known as the euryapsid condition and seen throughout Sauropterygia, the marine reptile group to which placodonts belong.

Cyamodontoids are also distinguished by their large crushing teeth, which grow from the palatine bones on the roof of the mouth.

Complete skeletons of placodonts were not known at the time of von Meyer's proposed classification, and the large shells of cyamodontoids were unknown.