The Lennon Sisters are an American vocal group made up of four sisters. The quartet originally consisted of Dianne (aka DeeDee; born Dianne Barbara, December 1, 1939), Peggy (born Margaret Anne, April 8, 1941), Kathy (born Kathleen Mary, August 2, 1943), and Janet (born Janet Elizabeth, June 15, 1946). From 1955 to 1968, the group appeared regularly on The Lawrence Welk Show (receiving union scale wages) before having their own television variety show, called Jimmy Durante Presents the Lennon Sisters, with Jimmy Durante. After the show was cancelled, they partnered with Andy Williams to create a successful Las Vegas residency, which lasted a decade. In 1999, younger sister Mimi (born Miriam Theresa, October 16, 1955) replaced Peggy upon the latter's retirement. DeeDee has also since retired. The current line-up of the Lennon Sisters is a trio consisting of Kathy, Janet, and Mimi. They continue to tour around the country and, until recently, performed annually with their Christmas show at The Andy Williams Moon River Theatre in Branson, Missouri.

In 2001, they were inducted into the Vocal Group Hall of Fame.