The Boswell Sisters were a close harmony singing group, consisting of sisters Martha Boswell, Connee Boswell (original name Connie), and Helvetia "Vet" Boswell, noted for intricate harmonies and rhythmic experimentation. They attained national prominence in the USA in the 1930s.

Later groups such as the Pfister Sisters, the Stolen Sweets, Boswellmania, the Puppini Sisters, YazooZazz, the Spanish group O Sister!, the Italian trio Sorelle Marinetti, and the Israeli band the Hazelnuts imitated the sisters' recordings. Canada's Company B Jazz Band includes many Boswell Sisters arrangements in its repertoire and even created a set saluting the Boswells' appearance in Transatlantic Merry-Go-Round for the cover of their second album, Rock & Roll. The Ditty Bops have covered Boswell Sisters songs in concert. Caffeine Trio from Brazil also claims to have been influenced by them. There is also an Australian group, the Boswell Project, based in Adelaide, South Australia. A London harmony trio, The Haywood Sisters, have also recorded some Boswell Sisters hits and are greatly influenced by their style.

In 2001, The Boswell Sisters, a major musical based on their lives, was produced at the Old Globe Theatre in San Diego, California. The play starred Michelle Duffy, Elizabeth Ward Land, and Amy Pietz and was produced by the same team that produced Forever Plaid. The show was a hit with audiences and a critical success, but failed to be picked up for a much hoped-for Broadway run.

The Boswell Sisters were inducted into the Vocal Group Hall of Fame in 1998. At a ceremony covered by the Pfister Sisters, the Boswells were inducted into the Louisiana Music Hall of Fame in 2008.