John Freeman Mackie (October 1, 1835 – June 18, 1910) was a United States Marine Corps sergeant during the American Civil War.

He was awarded the nation's highest military decoration for valor—the Medal of Honor, for his actions aboard the USS Galena during the battle with Confederate Marines and artillery batteries at Fort Darling near Richmond, Virginia, on May 15, 1862.

[4] On May 15, a five-ship Union Navy squadron, including the Galena, steamed up the James River to test the defenses of the Confederate capital, Richmond, Virginia.

At Drewry's Bluff, now within Richmond National Battlefield Park, a marker is posted which features Mackie's Medal of Honor action.

Mackie's Medal of Honor Citation reads:[12] Rank and Organization: Corporal, U.S. Marine Corps Born: 1836, New York, N.Y.

As enemy shellfire raked the deck of his ship, Corporal Mackie fearlessly maintained his musket fire against the rifle pits along the shore and, when ordered to fill vacancies at guns caused by men wounded and killed in action, manned the weapon with skill and courage.