- The Idolatry Pop Orchestra -- The Insatiables
- The Insect -- The Jack Farina Big Band
- The Jack Fords -- The Jeep Girrlz
- The Jeevas -- The John Kirkpatrick Band
- The John LaSalle Quartet -- The Junglemen
- The Junglists -- The Kidds
- The Kidlington Kossacks -- The Knives Of Neptune
- The Knobs -- The LaSalles
- The Lascivious Biddies -- The Lee Boys
- The Lee Brothers -- The Like Young
- The Likely Lads -- The London Oratory School Schola
- The London Orchestra -- The Love Machine
- The Love Me Do's -- The Love Revolt