Walter S. Plock (July 2, 1869 – April 28, 1900) was an American professional baseball player, who appeared in two games for the 1891 Philadelphia Phillies. In six at bats, he collected two hits, and scored two runs. In addition to his short stint as a Major League Baseball player, he played in six minor league seasons. Plock was born in Philadelphia, Pennsylvania, and died at the age of 30 in Richmond, Virginia of a bridge accident. He is interred in his hometown of Philadelphia in Mount Peace Cemetery.