Severn is a census-designated place (CDP) in Anne Arundel County, Maryland, United States.

It is bordered by Hanover to the north, Glen Burnie to the east, Odenton and Millersville to the south, and Fort George G. Meade to the west.

Part of the southern boundary of the CDP is formed by the non-tidal portion of the Severn River.

The Maryland Route 100 freeway runs through the northern part of the CDP, connecting the B-W Parkway and I-97.

According to the United States Census Bureau, the CDP has a total area of 17.7 square miles (45.9 km2), all of it land.