John "Jocko" Milligan (August 8, 1861 in Philadelphia – August 29, 1923 in Philadelphia) was a professional baseball player who played catcher in the Major Leagues from 1884 to 1893.
He played for the Philadelphia Athletics, St.
Louis Browns, Washington Senators, Baltimore Orioles, and New York Giants.He died on August 29, 1923 in Philadelphia, Pennsylvania and is interred at Mount Moriah Cemetery.