| Ohgr |
3 |
| Ohio Express |
3 |
| Ohio Players |
5 |
| Ohio State Buckeyes |
3 |
| Ohrbooten |
3 |
| Oi Polloi |
9 |
| Oi Va Voi |
6 |
| Oingo Boingo |
13 |
| Ojamajo Doremi |
3 |
| Ojos De Brujo |
13 |
| Ok Go |
3 |
| Okina Reika |
4 |
| Okkervil River |
21 |
| Oklahoma! |
6 |
| Oksana Angel |
3 |
| Ola Magnell |
25 |
| Ola Podrida |
3 |
| Olaf Henning |
11 |
| Old 97's |
23 |
| Old Bear Mountain |
4 |
| Old Blind Dogs |
4 |
| Old Boy Network |
10 |
| Old Canes |
3 |
| Old Crow Medicine Show |
19 |
| Old Man Luedecke |
14 |
| Old Man Markley |
3 |
| Old Mans Child |
6 |
| Oldelaf Et Monsieur D |
4 |
| Oldfield Mike |
8 |
| Oldfield Sally |
3 |
| Oleander |
10 |
| Oleta Adams |
11 |
| Olga Tanon |
13 |
| Olga Tañon |
4 |
| Olga Tañón |
4 |
| Oli.P |
5 |
| Olin & The Moon |
3 |
| Olive |
3 |
| Oliver |
9 |
| Oliver Cheatham |
5 |
| Oliver Dragojevic |
5 |
| Olivia |
7 |
| Olivia Broadfield |
4 |
| Olivia Holt |
7 |
| Olivia Lufkin |
69 |
| Olivia Newton John |
7 |
| Olivia Newton-John |
73 |
| Olivia Olson |
3 |
| Olivia Ong |
7 |
| Olivia Ruiz |
30 |
| Olivia The Band |
7 |
| Olivier Miller |
9 |
| Olli Schulz Und Der Hund Marie |
16 |
| Olly Murs |
53 |
| Olsen Twins |
20 |
| Olympe |
26 |
| Om Shanti Om |
3 |
| Oman Freestyle |
3 |
| Omar |
3 |
| Omarion |
46 |
| Omd |
26 |
| Omega |
7 |
| Omega El Fuerte |
3 |
| Omen |
5 |
| Omnia |
20 |
| Omnium Gatherum |
6 |
| Omsk |
4 |
| Omul Cu Sobolani |
3 |
| On |
3 |
| On Broken Wings |
4 |
| On thorns i lay |
9 |
| Onda Vaga |
7 |
| One Chance |
22 |
| One Direction |
126 |
| One Dollar Short |
3 |
| One For The Team |
3 |
| One Less Reason |
45 |
| One Man Army |
7 |
| One Minute Silence |
4 |
| One More Time |
5 |
| One Nation Crew |
3 |
| One Night Only |
25 |
| One Piece |
61 |
| One Republic |
76 |
| One Tree Hill |
22 |
| One Vo1ce |
5 |
| One Voice |
5 |
| One Way |
3 |
| One Way System |
3 |
| One Without |
4 |
| One-Eyed Doll |
4 |
| One-T |
3 |
| OneRepublic |
10 |
| OneTwo |
4 |
| Oneiroid Psychosis |
7 |
| Onelight |
7 |
| Onerepublic |
3 |
| Onmyouza |
12 |
| Onze:20 |
3 |
| Oobik & The Pucks |
5 |