Cape St. Elias Light, Historic lighthouse on Kayak Island in Chugach Census Area, Alaska.

The Cape St. Elias Light is a lighthouse on the southern part of Kayak Island in Alaska's Chugach Census Area. It began operating in 1916 and was automated by the U.S. Coast Guard in 1974. In 1998 a solar-powered Vega optic replaced the original Fresnel lens, which is now held at the Cordova Museum. The lighthouse was listed on the National Register of Historic Places in 1975.

Construction was approved in 1913 and the structure began operating in 1916 to guide maritime traffic safely. A radio beacon system was added in 1927, making it one of the most advanced navigation aids in Alaska at that time.

The light is leased by the Cape St. Elias Lightkeepers Association, a non-profit group devoted to preserving, restoring and sharing the station. Its keepers also notified the ports of Cordova, Valdez, Seward and Anchorage of arriving ships by radio from 1916.

The lighthouse is accessible only by boat since the island has no nearby shipping or air transit hub. Visitors should prepare for rough weather and tidal effects that may impact travel to the site or exploration of the surrounding area.

The station's radio beacon, fitted in 1927, was only the second such installation in Alaska. Keepers used radio to alert Cordova, Valdez, Seward and Anchorage of approaching ships, a task handled from the station itself in 1916.