Seyfert is a prominent lunar impact crater that is located on the far side of the Moon. It lies behind the eastern limb of the Moon, to the east of Espin crater. Just to the north of Seyfert is the Harriot crater and equally close to the south is Polzunov crater.

Type of galaxy with a point-like nucleus and very faint spiral arms, first described in 1943 by American astrophysicist Carl Seyfert. Such galaxies have since been shown to belong to a wider class of objects known as active galactic nuclei.