In enzymology, a 3-ò(or 20-ñ)-hydroxysteroid dehydrogenase () is an enzyme that catalyzes the chemical reaction
This enzyme possesses the combined activities of the 3-ò-hydroxysteroid dehydrogenase/ÃÂ-5-4 isomerase and 20-ñ-hydroxysteroid dehydrogenase enzymes.