Cecil Lewis "Young Jack" Thompson (August 17, 1904 – April 11, 1946) was an African American boxer who twice held the World Welterweight Championship. He was the first African American to gain the World Welterweight Championship. Born Cecil Lewis Thompson, his name was changed when he decided to become a professional fighter. His father, who was training him, did not think "Cecil" was a fighter's name, so he chose "Jack." To avoid confusion with another fighter named "Jack Thompson," his father decided to use the ring name Young Jack Thompson.