The Old Man House was the largest winter longhouse in what is now the U.S. state of Washington, once standing on the shore of Puget Sound.

The lands around Old Man House were retained by the Suquamish tribe after the Point Elliott Treaty was signed in 1855, becoming the Port Madison Indian Reservation.

After it was burned, however, the Suquamish rebuilt their village at the site and continued to live there, which led to DeShaw resigning from the Bureau of Indian Affairs.

In 1904 the U.S. War Department acquired land along Agate Pass, including the site of Old Man House, to build fortifications to protect the new naval shipyards at Bremerton.

The fortifications were never built, and the land purchased by the military was eventually sold in 1937 to a private developer and subdivided for vacation homes.