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Pachydiscus is an extinct genus of Ammonite from the Late Cretaceous and Early Paleocene with a worldwide distribution, and type for the desmoceratacean family Pachydiscidae. The genus' type species is P. neubergicus. Altogether some 28 species have been described.

The shell of Pachydiscus is compressed and high-whorled, with an oval or flat sided section. Ribs tend to be differentiated into short umbilical and separate ventro-lateral sets, with a smooth area between. Some Hungarian specimens of this genus reached 40 centimeters (16 inches) in diameter.

Pachydiscus includes 2 subgenera, P. (Pachysiscus) from the Campanian in which the ribs persist, and P. (Neodesmoceras) from the Maastrichtian in which ribs disappear early, leaving an almost smooth shell.

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It has only appeared in Jurassic Park III: Park Builder.

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