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. He served under the name John S. Lann. Born on August 29, 1843, in Rochester, New York, Lanning joined the Navy from that state. By March 5, 1865, he was serving as a landsman on the USS Magnolia. On that day and the next, he accompanied a Union Army force during the Battle of Natural Bridge near St. Marks, Florida. He helped transport and fire a naval howitzer throughout the engagement despite heavy Confederate fire. For this action, he was awarded the Medal of Honor three months later, on June 22, 1865. The medal was issued under the name he had enlisted with, John S. Lann. He was one of six sailors to receive the medal for manning artillery