- 1. O-Zone
- 2. o.n.a.
- 3. O.N.C.E.
- 4. O.S.T.R.
- 5. Oakenfold, Paul
- 6. Oasis
- 7. Oaths, The
- 8. Obel, Agnes
- 9. Obernik, Sam
- 10. Obey the Brave
- 11. Obispo, Pascal
- 12. OBK
- 13. Obojeni program
- 14. Obscurity
- 15. Obsidia
- 16. Ocasek, Ric
- 17. Oceán
- 18. Ocean Blue, The
- 19. Ocean, Billy
- 20. Ocean, Danny
- 21. Ocean, Frank
- 22. Oceana
- 23. Ocho Macho
- 24. Ochoa, Eliades
- 25. Ochs, Phil
- 26. Octavia
- 27. Octavian
- 28. Oddisee
- 29. Odell, Tom
- 30. ODESZA
- 31. Odett
- 32. Odisseo
- 33. Oerding, Johannes
- 34. Oesch's die Dritten
- 35. Of Mice & Men
- 36. Of Monsters and Men
- 37. of Montreal
- 38. Off With Their Heads
- 39. OFF!
- 40. Offishall, Kardinal
- 41. Offset
- 42. Offspring, The
- 43. Oğur, Erkan
- 44. Oh Land
- 45. Oh Mercy
- 46. Oh Wonder
- 47. Oh, Sleeper
- 48. Oh, Weatherly
- 49. Ohio Express
- 50. OIAM
- 51. OK KID
- 52. OK Sweetheart
- 53. Okkervil River
- 54. Okosun, Sonny
- 55. Olamide
- 56. Olcay, Zuhal
- 57. Old Crow Medicine Show
- 58. Old Dominion
- 59. Old Man Saxon
- 60. Oldfield, Mike
- 61. Olé Olé
- 62. Olexesh
- 63. Oli P.
- 64. Ollie
- 65. Ölmez, Orhan
- 66. Olomidé, Koffi
- 67. OLY
- 68. Ol’ Kainry
- 69. Omarion
- 70. OMB Peezy
- 71. Ombladon
- 72. Omega
- 73. OMFG
- 74. OMI
- 75. Omnia
- 76. Omnimar
- 77. Omp El Capitan
- 78. Önal, Füsun
- 79. Onda Vaselina
- 80. One Chance
- 81. One Day as a Lion
- 82. One Direction
- 83. One Hundred, The
- 84. One Less Reason
- 85. One More Time
- 86. One Morning Left
- 87. ONE OK ROCK
- 88. One True Voice
- 89. OneRepublic
- 90. Onete, Dona
- 91. Only Crime
- 92. Only Ones, The
- 93. Onuka
- 94. Onyx
- 95. Onze:20
- 96. Oobie
- 97. Oomph!
- 98. oOoOO
- 99. Open Mike Eagle
- 100. Open Season
- 101. Opera Magna
- 102. Operator Please
- 103. Opeth
- 104. Opposites, The
- 105. Ora, Rita
- 106. Orax
- 107. Orb, The
- 108. Orbison, Roy
- 109. Orchestral Manoeuvres in the Dark
- 110. Ord, Maren
- 111. Oreiro, Natalia
- 112. Oreja de Van Gogh, La
- 113. OrelSan
- 114. Orianthi
- 115. Origen
- 116. Original Naabtal Duo
- 117. Orishas
- 118. Orkesteri Liikkuvat Pilvet
- 119. Ormåsen, Gaute
- 120. Orme, Le
- 121. Ornatos Violeta
- 122. Orozco, Antonio
- 123. Orphaned Land
- 124. Orsen, Jack
- 125. Ortaç, Serdar
- 126. Ortel
- 127. Orthodox Celts
- 128. Ortíz, Gerardo
- 129. Ortiz, Joell
- 130. Ortiz, Kevin
- 131. Orton, Beth
- 132. Osborne, Joan
- 133. Osbourne, Ozzy
- 134. Oscar and Wolf, The
- 135. oshi
- 136. Osho, Josh
- 137. Oshun
- 138. Osk, Fanney
- 139. Oslin, K.T.
- 140. Osmi putnik
- 141. Osvajači
- 142. Others, The
- 143. Otilia
- 144. Otis Stacks
- 145. Otsochodzi
- 146. Ott, Kerstin
- 147. Ötzi, DJ
- 148. Où est le Swimming Pool
- 149. Oum
- 150. Our Hollow, Our Home
- 151. Our Lady Peace
- 152. Our Last Night
- 153. Our Mirage
- 154. Outfield, The
- 155. OutKast
- 156. Outlandish
- 157. Outlawz
- 158. OV7
- 159. Overkill
- 160. Owen
- 161. Owen, Jake
- 162. Owen, Mark
- 163. Owens, Buck
- 164. Owl City
- 165. Oxa, Anna
- 166. Oxymoron
- 167. Özbey, Merve
- 168. Ozcan, Ummet
- 169. Özen, Gökhan
- 170. Özen, Sinan
- 171. Özer, Zerrin
- 172. Özgün
- 173. Ozomatli
- 174. Ozuna
- 175. O‐Town
- 176. O’Brien, Olivia
- 177. O’Connor, Sinéad
- 178. O’Donovan, Aoife
- 179. O’Hearn, Patrick
- 180. O’Jays, The
- 181. O’Neal, Alexander