In medicine, dinoprostone, is a naturally occurring prostaglandin E2 (PGE2).

It is sold under the trade name of Cervidil (by Forest Laboratories Inc.) and Prostin E₂ (by Pfizer Inc.), as a vaginal suppository, to prepare the cervix for labour; it is used to induce labour.

The chemical name is (5Z,11(alpha),13E,15S)-11,15-Dihydroxy-9-oxo-prosta-5,13-dien-1-oic acid.