Jack Leroy Wilson Jr. (June 9, 1934 – January 21, 1984) was an American singer of the 1950s and 1960s. He was a prominent figure in the transition of rhythm and blues into soul. Nicknamed "Mr. Excitement", he was considered a master showman and one of the most dynamic singers and performers in soul, R&B, and rock and roll history. He hailed from Highland Park, a suburb of Detroit.

Wilson gained initial fame as a member of the R&B vocal group Billy Ward and His Dominoes. He went solo in 1957 and scored over 50 chart singles spanning the genres of R&B, rock 'n' roll, soul, doo-wop, and easy listening. This included 16 Top 10 R&B hits, six of which ranked as number ones. On the Billboard Hot 100, Wilson scored 14 top 20 pop hits, six of which reached the top 10. In 1975, Wilson suffered a heart attack during a performance, which left him in a minimally conscious state until his death in 1984.

Wilson was posthumously inducted to the Rock and Roll Hall of Fame in 1987. He is also inducted into the National Rhythm & Blues Hall of Fame. Two of Wilson's recordings were inducted into the Grammy Hall of Fame in 1999. He was honored with the Legacy Tribute Award from the Rhythm and Blues Foundation in 2003. In 2004, Rolling Stone ranked Wilson No. 69 on its list of the 100 Greatest Artists of All Time, and placed him on their list of the 200 Greatest Singers of All Time (2023). NPR named him one of the 50 Great Voices.