Louis Thomas Jordan (July 8, 1908 – February 4, 1975) was an American saxophonist, multi-instrumentalist, songwriter and bandleader who was popular from the late 1930s to the early 1950s. Known as "the King of the Jukebox", he earned his highest profile towards the end of the swing era. He was inducted into the Rock and Roll Hall of Fame as an "early influence" in 1987.

Specializing in the alto sax, Jordan played all forms of the saxophone, as well as piano and clarinet. He also was a talented singer with great comedic flair, and fronted his own band for more than twenty years. He duetted with some of the biggest solo singing stars of his time, including Bing Crosby, Ella Fitzgerald and Louis Armstrong. Jordan was also an actor and a film personality—he appeared in dozens of "soundies" (promotional film clips) He also made numerous cameos in mainstream features and short films, and starred in two musical feature films: Swing Parade of 1946, probably targeting white viewers and Caldonia (Astor Pictures, 1945) which appeared to be for a black audience. Jordan sang "Caldonia" in both productions.

Jordan began his career in big-band swing jazz in the 1930s, but he became known as an innovative popularizer of jump blues, a swinging, up-tempo, dance-oriented hybrid of jazz, blues and boogie-woogie. Typically performed by smaller bands consisting of five or six players, jump music featured shouted, highly syncopated vocals and earthy, comedic lyrics on contemporary urban themes. It strongly emphasized the rhythm section of piano, bass and drums; after the mid-1940s, this mix was often augmented by electric guitar. Jordan's band also pioneered the use of the electronic organ.

With his dynamic Tympany Five bands, Jordan mapped out the main parameters of the classic R&B, urban blues and early rock-and-roll genres with a series of highly influential 78-rpm discs released by Decca Records. These recordings presaged many of the styles of black popular music of the late 1940s, 1950s and 1960s and exerted a strong influence on many leading performers in these genres. Many of his records were produced by Milt Gabler, who went on to refine and develop the qualities of Jordan's recordings in his later production work with Bill Haley, including "Rock Around the Clock".

Jordan ranks fifth in the list of the most successful African-American recording artists according to Joel Whitburn's analysis of Billboard magazine's R&B chart, and was the most popular rhythm and blues artist with his "jump blues" recordings of the pre-rock n' roll era. Though comprehensive sales figures are not available, he had at least four million-selling hits during his career. Jordan regularly topped the R&B "race" charts, achieving the Number 1 slot eighteen times, with 113 weeks in that spot over the years. He was also one of the first black recording artists to achieve significant crossover in popularity with the predominantly white mainstream American audience, having simultaneous Top Ten hits on the pop charts on several occasions.