Smith Point Light is a caisson lighthouse in the Virginia portion of the Chesapeake Bay at the mouth of the Potomac River.

Smith Point, at the mouth of the Potomac River, has been marked by a succession of lights, having been served by three towers, three lightships, a screw-pile lighthouse, and the present caisson structure.

A long submarine cable was run to shore to power the light, with a battery backup to handle interruptions.

Damage to this cable in the 1980s brought the Coast Guard to consider discontinuing the light, but public outcry led to repairs in 1988.

In 2005 Smith Point Light went up for auction under the National Historic Lighthouse Preservation Act, and was purchased for $170,000 by David McNally, a builder from Winona, Minnesota.