John Ludwig Welaj (May 27, 1914 – September 13, 2003) was an American professional baseball outfielder and executive. He played in Major League Baseball (MLB) for four seasons between 1939 and 1943 for the Washington Senators and Philadelphia Athletics. Welaj (pronounced WELL-eye) was a native of Barr Township, Cambria County, Pennsylvania, who threw and batted right-handed and was listed as 6 feet (1.8 m) tall and 164 pounds (74 kg).