Lawson Duncan (born October 26, 1964) is a retired American tennis player.

The right-hander reached his highest Association of Tennis Professionals singles ranking on May 20, 1985, when he became world No.

His best performance in a grand slam tennis tournament was the 1989 French Open, where he reached the fourth round.

A pioneer of the heavy topspin game, he was an All-America at Clemson University his freshman year before turning pro.

He plays in exhibition matches against longtime friend and former pro Tim Wilkison during special banquets in the Asheville area.