Desdemona Sands Light, Historic lighthouse at Columbia River mouth, Oregon, United States.

Desdemona Sands Light is an octagonal wooden lighthouse that stood at the mouth of the Columbia River in Oregon, built on a pile foundation. The structure was equipped with a fourth-order Fresnel lens to guide ships through this crucial waterway.

The lighthouse was built in 1901 to replace the earlier Point Adams Light at this challenging river entrance. It remained active until its deactivation in 1965 when newer navigation aids made this location less essential for maritime safety.

The name Desdemona Sands comes from the bark Desdemona, wrecked on these shoals in 1857; the shoals had earlier been called Chinook Sands. The Fresnel lens from the light is now displayed at Mukilteo Light, and its fog bell at the Columbia River Maritime Museum in Astoria.

The lighthouse no longer exists: it was removed in 1965, so there is nothing to visit at the site. Its Fresnel lens is displayed at Mukilteo Light and its fog bell at the Columbia River Maritime Museum in Astoria. The present aid is an automated light on a small pile platform at the west end of the sandbank, flashing white every 4 seconds with a range of 12 nautical miles.

The light was electrified in 1934, which removed the need for a keeper on the isolated pile platform. Its fourth-order Fresnel lens is now displayed at Mukilteo Light, and its fog bell is kept at the Columbia River Maritime Museum in Astoria.