Semiahmoo Harbor Light, Maritime lighthouse in Semiahmoo Bay, Washington, US.

Semiahmoo Harbor Light was a 1½-story dwelling built on a platform supported by wooden piles, with a lantern at the center of its peaked roof. It stood on Semiahmoo Bay near the port of Blaine, Washington, and used the same design as Desdemona Sands Lighthouse.

The station was built in 1905 on Semiahmoo Bay near Blaine, Washington, using a design by U.S. Lighthouse Board architect Carl Leick already employed at the Desdemona Sands Lighthouse. The light was deactivated and the entire structure torn down in 1944.

The station's name comes from Semiahmoo Bay, itself named for the Semiahmoo people; locals pronounce it SEM-ee-AH-moh. The light stood off the port of Blaine in Whatcom County, marking the bay for passing vessels. Its 1905 design by Carl Leick reused the plan of Desdemona Sands Lighthouse at the mouth of the Columbia River.

The lighthouse stood on Semiahmoo Bay near the port of Blaine, Washington. The structure was torn down in 1944, so nothing of it remains to visit; the site is on the water and can only be approached by boat. Check water conditions and weather before setting out.

The station's 1½-story keeper's dwelling stood on wooden piles over the water, with the lantern set at the centre of its peaked roof. It was built in 1905 to the design architect Carl Leick had already used at Desdemona Sands Light at the mouth of the Columbia River. The light was switched off and the whole structure demolished in 1944.