Chief Boatswain's Mate William Densmore (b. about 1833 – d. June 17, 1865) was a Union Navy sailor in the American Civil War and a recipient of the U.S. military's highest decoration, the Medal of Honor, for his actions at the Battle of Mobile Bay.

He served during the Civil War as a chief boatswain's mate and gun captain on the USS Richmond.

Richmond during action against rebel forts and gunboats and with the ram Tennessee in Mobile Bay, 5 August 1864.

Despite damage to his ship and the loss of several men on board as enemy fire raked her decks, Densmore fought his gun with skill and courage throughout a furious 2-hour battle which resulted in the surrender of the rebel ram Tennessee and in the damaging and destruction of batteries at Fort Morgan.

[2]Medal of Honor recipient William Densmore died on June 17, 1865, of pneumonia and was buried in the Bishop's Burial Ground / Saint Joseph's Cemetery, Philadelphia, Pennsylvania, which was closed in August 1893 and the property sold in 1905.