- 1. O'Hara, Eureka
- 2. O'Neal, Jamie
- 3. O'Rourke, Declan
- 4. O-Zone
- 5. O.C. Supertones, The
- 6. O.F.T.B.
- 7. o.n.a.
- 8. O.N.C.E.
- 9. O.S.T.R.
- 10. Oasis
- 11. Oba Oba Samba House
- 12. Obel, Agnes
- 13. Obey the Brave
- 14. Obispo, Pascal
- 15. Obituary
- 16. OBK
- 17. OBN III's
- 18. Obrint Pas
- 19. Obscura
- 20. Ocasek, Ric
- 21. Oceán
- 22. Ocean Alley
- 23. Ocean Colour Scene
- 24. Ocean Drive
- 25. Ocean Wisdom
- 26. Ocean, Billy
- 27. Ocean, Danny
- 28. Oceano
- 29. Oceans Ate Alaska
- 30. Ocho Macho
- 31. Ochs, Phil
- 32. Octavian
- 33. Oddisee
- 34. Oddział Zamknięty
- 35. Odell, Tom
- 36. ODESZA
- 37. Odett
- 38. Odetta
- 39. Odisseo
- 40. Odua, Yaniss
- 41. ODV, Timo
- 42. Odyssey
- 43. Oerding, Johannes
- 44. Oesch's die Dritten
- 45. Of Mice & Men
- 46. Of Monsters and Men
- 47. of Montreal
- 48. Ofelia
- 49. Offishall, Kardinal
- 50. Offset
- 51. Offspring, The
- 52. Oğur, Erkan
- 53. Oh Land
- 54. Oh Mercy
- 55. Oh Wonder
- 56. Oh, Sleeper
- 57. Ohio Players
- 58. OIAM
- 59. Oingo Boingo
- 60. Ojos de Brujo
- 61. OK Go
- 62. OK KID
- 63. Olamide
- 64. Olcay, Zuhal
- 65. Old Crow Medicine Show
- 66. Old Dominion
- 67. Oldelaf
- 68. Oldfield, Mike
- 69. Olexesh
- 70. Olgun, Soner
- 71. Oli P.
- 72. Olivas, Alfredo
- 73. Olivija
- 74. Ölmez, Orhan
- 75. Olomidé, Koffi
- 76. Olsen, Angel
- 77. Olympic
- 78. Ol’ Dirty Bastard
- 79. Omaji, Tim
- 80. Omarion
- 81. OMB Peezy
- 82. Omega
- 83. Omega Vibes
- 84. OMFG
- 85. OMI
- 86. Omnia
- 87. Omnimar
- 88. Omri
- 89. Önal, Füsun
- 90. Öncel, Nazan
- 91. Onda Vaga
- 92. Ondrej Ďurica
- 93. One Direction
- 94. One Drop
- 95. One Less Reason
- 96. ONE OK ROCK
- 97. OneRepublic
- 98. OnklP & Slektningene, De Fjerne
- 99. Onuka
- 100. Onyx
- 101. Onze:20
- 102. Oobie
- 103. Oomph!
- 104. Opal
- 105. Open Mike Eagle
- 106. Opera Magna
- 107. Operator Please
- 108. Ophidian
- 109. Opposites, The
- 110. Or du Commun, L'
- 111. Ora, Rita
- 112. Orange and Lemons
- 113. Orax
- 114. Orb, The
- 115. Orbison, Roy
- 116. Orchestral Manoeuvres in the Dark
- 117. Orchid
- 118. Ordo Rosarius Equilibrio
- 119. Oreiro, Natalia
- 120. Oreja de Van Gogh, La
- 121. OrelSan
- 122. Organek
- 123. Orhan, Mahmut
- 124. Oriente
- 125. Orifice Vulgatron
- 126. Original Naabtal Duo
- 127. Original Rap Staff
- 128. Orishas
- 129. Oriska, DJ
- 130. Orkesteri Liikkuvat Pilvet
- 131. Orlek
- 132. Orloff, Peter
- 133. Ormåsen, Gaute
- 134. Orozco, Antonio
- 135. Orquesta Salserín
- 136. Orquesta Típica Victor
- 137. Orrico, Stacie
- 138. Orsen, Jack
- 139. Ortaç, Serdar
- 140. Orthodox Celts
- 141. Ortiz, Joell
- 142. Orton, Beth
- 143. Osborne, Brothers
- 144. Osborne, Joan
- 145. Osbourne, Ozzy
- 146. Oscar and Wolf, The
- 147. Oshun
- 148. Osment, Emily
- 149. Oswald
- 150. Otsochodzi
- 151. Ott, Kerstin
- 152. Ottaviani, Giuseppe
- 153. Otto Ohm
- 154. Otto, James
- 155. Otto, Natalino
- 156. Ötzi, DJ
- 157. Ouellet, Karim
- 158. Oum
- 159. Our Lady Peace
- 160. Our Last Night
- 161. Our Mirage
- 162. Our Past Days
- 163. Outfield, The
- 164. OutKast
- 165. Outlandish
- 166. Outsiders, The
- 167. OV7
- 168. Over, Lary
- 169. Overkill
- 170. Overstreet, Paul
- 171. OVERWERK
- 172. Owen, Jake
- 173. Owens, Buck
- 174. Owl City
- 175. Ownglow
- 176. Owsey
- 177. Oxa, Anna
- 178. Özbey, Merve
- 179. Ozcan, Ummet
- 180. Özdil, Özlem
- 181. Özen, Gökhan
- 182. Özen, Sinan
- 183. Özerk, Tuğba
- 184. Özgün
- 185. Ozuna
- 186. O‐Town
- 187. O’Brien, Olivia
- 188. O’Callaghan, John
- 189. O’Connor, Sinéad
- 190. O’Donnell, Daniel
- 191. O’Donovan, Aoife
- 192. O’Jays, The
- 193. O’Neal, Alexander
- 194. O’Riordan, Dolores