John S. Lanning (August 29, 1843 – April 13, 1907) was a Union Navy sailor and a Medal of Honor recipient for his actions in the American Civil War.

On that day and the next, he accompanied a Union Army force during the Battle of Natural Bridge near St. Marks, Florida.

[2][3] Lanning's official Medal of Honor citation reads: As landsman on board the U.S.S.

Magnolia, St. Marks, Fla., 5 and 6 March, Lann served with the Army in charge of Navy howitzers during the attack on St. Marks and throughout this fierce engagement made remarkable efforts in assisting transport of the gun.

His coolness and determination in standing by his gun while under the fire of the enemy were a credit to the service to which he belonged.