- 1. O Trio do Brasil
- 2. O'Connor, Hazel
- 3. O'Connor, Jennifer
- 4. O'Rourke, Declan
- 5. O-Zone
- 6. O.F.T.B.
- 7. O.G.C.
- 8. o.n.a.
- 9. O.S.T.R.
- 10. Oakenfold, Paul
- 11. Oasis
- 12. Obel, Agnes
- 13. Oberst, Conor
- 14. Obey the Brave
- 15. Obispo, Pascal
- 16. Obituary
- 17. OBK
- 18. OBN III's
- 19. Obrint Pas
- 20. Obscura
- 21. Oceán
- 22. Ocean Blue, The
- 23. Ocean Colour Scene
- 24. Ocean Drive
- 25. Ocean, Being as an
- 26. Ocean, Billy
- 27. Oceano
- 28. Oceans
- 29. Oceans Ate Alaska
- 30. Oceans of Slumber
- 31. Ocho Macho
- 32. Ochoa, Amparo
- 33. Octavia
- 34. Octavian
- 35. Oddisee
- 36. Odell, Tom
- 37. ODESZA
- 38. Odisseo
- 39. Odua, Yaniss
- 40. Odyssey
- 41. Oerding, Johannes
- 42. Oesch's die Dritten
- 43. Of Mice & Men
- 44. Of Monsters and Men
- 45. of Montreal
- 46. Ofelia
- 47. Off With Their Heads
- 48. Offishall, Kardinal
- 49. Offset
- 50. Offspring, The
- 51. Ofi
- 52. OGRE
- 53. Oh Land
- 54. Oh Sees
- 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. Okereke, Kele
- 64. Okkervil River
- 65. Okmalumkoolkat
- 66. Ola Runt
- 67. Olaf (der Flipper)
- 68. Olamide
- 69. Olcay, Zuhal
- 70. Old Crow Medicine Show
- 71. Old Dominion
- 72. Old Man Canyon
- 73. Oldelaf
- 74. Oldfield, Mike
- 75. Ole Ivars
- 76. Olexesh
- 77. Oli P.
- 78. Olivas, Alfredo
- 79. Ollie & Jerry
- 80. Ölmez, Orhan
- 81. Olomidé, Koffi
- 82. OLY
- 83. Olympic Ayres
- 84. Ol’ Kainry
- 85. Omarion
- 86. OMFG
- 87. OMI
- 88. Omnia
- 89. Omnimar
- 90. Önal, Ayşe Hatun
- 91. Önal, Füsun
- 92. Öncel, Nazan
- 93. One Bad Son
- 94. One Desire
- 95. One Direction
- 96. ONE OK ROCK
- 97. One System
- 98. One Two
- 99. One Way
- 100. One-T + Cool-T
- 101. Oneohtrix Point Never
- 102. OneRepublic
- 103. OneUps, The
- 104. Onlap
- 105. Only Crime
- 106. Only Ones, The
- 107. Onuka
- 108. Onyx
- 109. Onze:20
- 110. Oobie
- 111. Ookay
- 112. Oomph!
- 113. Oosterhuis, Trijntje
- 114. Opal
- 115. Open Mike Eagle
- 116. Operator Please
- 117. Opick
- 118. Opposites, The
- 119. Ora, Rita
- 120. Orange and Lemons
- 121. Orange Goblin
- 122. Orax
- 123. Orbison, Roy
- 124. Orchestral Manoeuvres in the Dark
- 125. Oreiro, Natalia
- 126. Oreja de Van Gogh, La
- 127. OrelSan
- 128. Orhan, Mahmut
- 129. Oriente
- 130. Original Alpenland Quintett
- 131. Original Naabtal Duo
- 132. Oriska, DJ
- 133. Orlando, Johnny
- 134. Orme, Le
- 135. Orozco, Antonio
- 136. Orquesta Broadway
- 137. Orrico, Stacie
- 138. Ortaç, Serdar
- 139. Ortaçgil, Bülent
- 140. Orthodox Celts
- 141. Ortíz, Gerardo
- 142. Ortiz, Kevin
- 143. Osborne Brothers, The
- 144. Osborne, Joan
- 145. Osbourne, Ozzy
- 146. Oscar and Wolf, The
- 147. Oshun
- 148. Osment, Emily
- 149. Otep
- 150. Others, The
- 151. Otilia
- 152. Otis Stacks
- 153. Otsochodzi
- 154. Ott, Kerstin
- 155. Otter, Anne Sofie von
- 156. Otto, James
- 157. Ötzi, DJ
- 158. Ouellet, Karim
- 159. Our Hollow, Our Home
- 160. Our Lady Peace
- 161. Our Last Night
- 162. Our Mirage
- 163. Outfield, The
- 164. Outhere Brothers, The
- 165. OutKast
- 166. Outlandish
- 167. Outlawz
- 168. OV7
- 169. Overstreet, Paul
- 170. OVERWERK
- 171. Owen
- 172. Owen, Jake
- 173. Owens, Buck
- 174. Owl City
- 175. Ownglow
- 176. Oxa, Anna
- 177. Oxmo Puccino
- 178. Özbey, Merve
- 179. Ozcan, Ummet
- 180. Özen, Gökhan
- 181. Özen, Sinan
- 182. Özgün
- 183. Ozuna
- 184. O‐Town
- 185. O’Brien, Olivia
- 186. O’Connor, Sinéad
- 187. O’Donis, Colby
- 188. O’Donnell, Daniel
- 189. O’Donovan, Aoife
- 190. O’Jays, The
- 191. O’Neal, Alexander
- 192. O’Riordan, Dolores
- 193. O’Sullivan, Gilbert