Duwamish, Museum ship and fireboat at South Lake Union Park, Seattle, United States.

The Duwamish is a steel-hulled fireboat roughly 37 meters long that served as one of the most powerful fire-suppression vessels of the early 20th century. Its main deck houses three original steam-powered pumps that were the heart of its firefighting system.

Built in 1909 at Richmond Beach, Washington, for the Seattle Fire Department, Duwamish fought the Grand Trunk Pacific dock fire on July 30, 1914. In the 1930s the city council had it push garbage scows as a cost-saving measure, and a 1949 upgrade raised its pumping capacity to 22,800 US gallons per minute. It was retired in 1985, bought by the Puget Sound Fireboat Foundation, and named a National Historic Landmark in 1989.

The name Duwamish comes from the Indigenous Duwamish people of the Seattle area. In the 1930s the city council ordered the vessel used as a tug pushing the municipal garbage scow, a cost-saving role far from firefighting. Today volunteers of the Puget Sound Fireboat Foundation keep her open for boarding at the Historic Ships Wharf.

Visitors can tour the deck, engine room, and command center with volunteer guides who lead visits throughout the year. It is best to wear comfortable shoes and be prepared for narrow stairs and low ceilings inside the vessel.

Duwamish was built with a ram bow so she could sink burning wooden vessels as a last resort. In the 1930s, as a cost-saving measure, the Seattle City Council directed that she be used as a tug to push the city's garbage scow.