Dixieland music, sometimes referred to as Hot jazz, Early Jazz or New Orleans jazz, is a style of jazz music which developed in New Orleans at the start of the 20th century, and was spread to Chicago and New York City by New Orleans bands in the 1910s. Well-known jazz standard songs from the Dixieland era, such as "Basin Street Blues" and "When the Saints Go Marching In", are known even to non-jazz fans.

Dixieland, an early style of Jazz that was developed in New Orleans, is the earliest style of Jazz music. The style combined earlier brass band marches, French Quadrilles, ragtime and blues with collective, polyphonic improvisation. While instrumentation and size of bands can be very flexible, the "standard" band consists of a "front line" of trumpet (or cornet), trombone, and clarinet, with a "rhythm section" of at least two of the following instruments: guitar or banjo, string bass or tuba, piano, and drums.

The term Dixieland became widely used after the advent of the first million-selling hit records of the Original Dixieland Jazz Band in 1917. The music has been played continuously since the early part of the 20th century. Louis Armstrong's All-Stars was the band most popularly identified with Dixieland, although Armstrong's own influence runs through all of jazz.