Fort Shafter is a census-designated place[1] located in the City and County of Honolulu, Hawai‘i.

Construction began in 1905 on the ahupua'a of Kahauiki, former Hawaiian crown lands that were ceded to the United States government after annexation.

When the post opened in 1907, it was named for Major General William Rufus Shafter (1835–1906), who led the United States expedition to Cuba in 1898.

War came to Fort Shafter on 7 December 1941, where the Hawaiian Department commander, Lieutenant General Walter C. Short, occupied Quarters 5.

One soldier, Corporal Arthur A. Favreau, 64th Coast Artillery (Anti-Aircraft), was killed on post by an errant Navy shell.

For most of the time since the Second World War, Fort Shafter has remained the senior Army headquarters for the Asia-Pacific region.

In 1983, the Army conveyed to the State of Hawaii 750 acres (3.0 km2) of undeveloped land on the northern end of post.