The Admiralty Head Light is a lighthouse located in Fort Casey State Park near Coupeville on Whidbey Island, WA. Admiralty Head is the east entrance point of Admiralty Inlet and the southeast extremity of a succession of light bare bluffs which extend north of Point Partridge, where they attain their highest elevation.

In 1858 the United States purchased 10 acres (40,000 m²) of land costing $400 for the location of the lighthouse. The original lighthouse was completed during the months just prior to the Civil War and was among the West's earliest navigational aids. It had a fourth order Fresnel lens, and the light could be seen sixteen miles away. This light welcomed Puget Sound marine traffic to Admiralty Inlet. In 1890, with construction of the fort to protect Admiralty Inlet, the light was relocated, relinquishing the building and site to the U.S. Army. The original Red Bluff wooden lighthouse was demolished to make room for soldiers and guns in Fort Casey.

The replacement lighthouse, constructed of brick and stucco, was built in 1903 but was discontinued in 1922. It was the last brick lighthouse designed by renowned German architect Carl Leick. During its later occupancy by the Army, the lighthouse was used as a training facility for the K-9 dog program.