- O-Zone 1 songs
- O.A.R. 3 songs
- Oasis 16 songs
- Ocean Park Standoff 1 songs
- Of Mice And Men 2 songs
- Of Monsters And Men 10 songs
- Of Montreal 1 songs
- Oh Honey 1 songs
- Oh Land 3 songs
- Oh Wonder 3 songs
- Old 97's 2 songs
- Old Crow Medicine Show 1 songs
- Olin And The Moon 1 songs
- Oliver Tree 1 songs
- Olivia Holt 1 songs
- Olivia Newton-John 1 songs
- Olivia O'Brien 1 songs
- Olivia Olson 2 songs
- Olivia Rodrigo 6 songs
- Olivia Willhite 1 songs
- Olly Murs 19 songs
- Omar Apollo 1 songs
- OMI 1 songs
- One Direction 79 songs
- One Ok Rock 1 songs
- OneRepublic 21 songs
- Ooklah The Moc 1 songs
- OR3O 1 songs
- Orianthi 1 songs
- Orla Gartland 2 songs
- Orleans 1 songs
- Oscar Anton 1 songs
- Oscar Isaac 2 songs
- Otis Redding 1 songs
- Our Lady Peace 1 songs
- Outkast 2 songs
- Owl City 21 songs