William Garrett (February 6, 1842 – December 30, 1916) was a Manx-born American soldier who fought in the American Civil War.

Garrett received his country's highest award for bravery during combat, the Medal of Honor.

[2] Garrett was born on the Isle of Man, entered service in Chardon, Ohio, and was buried in Leavenworth National Cemetery.

[1] The President of the United States of America, in the name of Congress, takes pleasure in presenting the Medal of Honor to Sergeant William Garrett, United States Army, for extraordinary heroism on 16 December 1864, while serving with Company G, 41st Ohio Infantry, in action at Nashville, Tennessee.

With several companions Sergeant Garrett dashed forward, the first to enter the enemy's works, taking possession of four pieces of artillery and captured the flag of the 13th Mississippi Infantry (Confederate States of America).