William James Lombardy (born December 4, 1937) is an American Grandmaster of chess.
In 1957, he became the first American to win the World Junior Chess Championship. He represented his country in several Chess Olympiads and served as the official "second" to Robert James Fischer during his World Championship match in 1972 against Boris Spassky. A former Catholic priest, Lombardy is now retired and lives in New York City.