- The NewBand -- The Nilsson Sisters Violin Trio
- The Nimmo Brothers -- The Northern Territories
- The Northern Way -- The Nzso
- The O -- The Old Fashioned Revival Hour Quartet
- The Old Fourth -- The Orange Mighty Trio
- The Orange Ocean -- The Original St. Louis Crackerjacks
- The Original Surfaris -- The Outlaws of Zen
- The Outlaws (UK) -- The Palisades
- The Palladinos -- The Party Group
- The Party of Helicopters -- The Pearls Before Swine Experience
- The Pearly Gatecrashers -- The Pete Haycock Band
- The Pete King Chorale & Orchestra -- The Piano Duo
- The Piano Guys -- The Pj Clare Band
- The Pla2n -- The Poets of Rhythm
- The Pogo Project -- The Posies
- The Positions -- The Pretenders
- The Pretty Reckless -- The Project
- The Project -- The Pulsators
- The Pulse Is Overrated -- The Quickest Way Out
- The Quiet Boys -- The Rain Troubadours
- The Rainbirds -- The Rattlers