Donald James Johnson is an American former professional tennis player who reached the World No. 1 doubles ranking in 2002. Although born in Bethlehem, Pennsylvania, he was raised and learned the sport of tennis in the Pittsburgh suburb of Mt. Lebanon, Pennsylvania. Johnson attended Fairview High School in Erie, Pennsylvania, and won the PIAA State Singles Championship in 1984. During his career, he won the Wimbledon men's doubles title in 2001, and the Wimbledon mixed doubles title in 2000. He also won the doubles title at the Tennis Masters Cup in 2000. He won a total of 23 top-level doubles titles.