- 1. O'Connor, Hazel
- 2. O'Day, Anita
- 3. O'ktam Kamalov
- 4. O'Neal, Jamie
- 5. O-
- 6. O-Zone
- 7. O.C. Supertones, The
- 8. O.G.C.
- 9. o.n.a.
- 10. O.N.C.E.
- 11. O.S.T.R.
- 12. O.Torvald
- 13. Oak Ridge Boys, The
- 14. Oak, Winona
- 15. Oakenfold, Paul
- 16. Oasis
- 17. Obel, Agnes
- 18. Obispo, Pascal
- 19. Obituary
- 20. OBLXKQ
- 21. OBOY
- 22. Ocean Blue, The
- 23. Ocean Colour Scene
- 24. Ocean Drive
- 25. Ocean Park Standoff
- 26. Ocean, Being as an
- 27. Ocean, Billy
- 28. Ocean, Danny
- 29. Oceana
- 30. OceanLab
- 31. Oceano
- 32. Oceans
- 33. Oceans Ate Alaska
- 34. Oceansize
- 35. Ocho Macho
- 36. Ochoa, Eliades
- 37. Ochs, Phil
- 38. Octagon, Dr.
- 39. Oddisee
- 40. Odell, Tom
- 41. Oden & Fatzo
- 42. OdESSA
- 43. ODESZA
- 44. Odezenne
- 45. Odisea
- 46. Odisseo
- 47. Of Mice & Men
- 48. Of Monsters and Men
- 49. of Montreal
- 50. Of The Wand & The Moon
- 51. Ofarim, Gil
- 52. Ofenbach
- 53. Offa Rex
- 54. Offishall, Kardinal
- 55. Offlaga Disco Pax
- 56. Offset
- 57. Offspring, The
- 58. Oficina G3
- 59. OG BUDA
- 60. Oh Hellos, The
- 61. Oh Land
- 62. Oh Sees
- 63. Oh Wonder
- 64. Oh, Nadia
- 65. Oh, Sleeper
- 66. OhGeesy
- 67. Ohio Express
- 68. OIAM
- 69. Oingo Boingo
- 70. OK Go
- 71. OK KID
- 72. Okay Kaya
- 73. Oklou
- 74. Ola Runt
- 75. Oláh Ibolya
- 76. Olamide
- 77. Old Crow Medicine Show
- 78. Old Dominion
- 79. Old Man Saxon
- 80. Oldelaf
- 81. Oldfield, Mike
- 82. Ole Ivars
- 83. Oleander
- 84. Olexesh
- 85. Oli P.
- 86. Olisha
- 87. Olivas, Alfredo
- 88. Olive
- 89. Oliver $
- 90. Olivia
- 91. Olivia Lane
- 92. Ölmez, Orhan
- 93. Olomidé, Koffi
- 94. Olsen, Angel
- 95. Olsson, Linnea
- 96. Olympic Ayres
- 97. Ol’ Dirty Bastard
- 98. Ol’ Skool
- 99. Omar Apollo
- 100. Omarion
- 101. OMB Peezy
- 102. OMC
- 103. Omega
- 104. Omg Girlz, The
- 105. OMI
- 106. Omnia
- 107. Önal, Ayşe Hatun
- 108. Önal, Füsun
- 109. Once Tiros
- 110. Öncel, Nazan
- 111. Onda Vaga
- 112. One Chance
- 113. One Desire
- 114. One Direction
- 115. One Dollar Short
- 116. One Million Dollar
- 117. One More Time
- 118. One Night Only
- 119. ONE OK ROCK
- 120. One True Voice
- 121. One, Albert
- 122. One-T + Cool-T
- 123. OneRepublic
- 124. Ong, Olivia
- 125. Only Ones, The
- 126. Onuka
- 127. Onyx
- 128. Onze:20
- 129. Oobie
- 130. Oomph!
- 131. Oonagh
- 132. Oosterhuis, Trijntje
- 133. Open Kids
- 134. Open Kids ft. NEBO5
- 135. Opeth
- 136. Opgezwolle
- 137. Ophidian
- 138. OPIUM project
- 139. Opposites, The
- 140. Opshop
- 141. Opus Draconis
- 142. Opus III
- 143. Or du Commun, L'
- 144. Ora, Rita
- 145. Orange and Lemons
- 146. Orange Goblin
- 147. Orb, The
- 148. Orbison, Roy
- 149. Orchestral Manoeuvres in the Dark
- 150. Orchid
- 151. Oreia, Hot e
- 152. Oreiro
- 153. Oreiro, Natalia
- 154. Oreja de Van Gogh, La
- 155. OrelSan
- 156. Organ, The
- 157. Orgi-E
- 158. Orgy
- 159. Orhan, Mahmut
- 160. Orianthi
- 161. Original Naabtal Duo
- 162. Orion
- 163. Orishas
- 164. Orlando, Johnny
- 165. Orlando, Ramón
- 166. Orme, Le
- 167. Orozco, Antonio
- 168. Orquesta Inmensidad
- 169. Orr, Benjamin
- 170. Orrico, Stacie
- 171. Orsi
- 172. Ortaç, Serdar
- 173. Orthodox Celts
- 174. Ortíz, Gerardo
- 175. Ortiz, Joell
- 176. Ortiz, Kevin
- 177. Orville Peck
- 178. Orwells, The
- 179. Orzabal, Roland
- 180. Os Quatro e Meia
- 181. Osama, Lil Zay
- 182. Osatia
- 183. Osborne, Brothers
- 184. Osborne, Joan
- 185. Osbourne, Kelly
- 186. Osbourne, Ozzy
- 187. Oscar and Wolf, The
- 188. Osdorp Posse
- 189. Oshun
- 190. Osiris, YK
- 191. Osment, Emily
- 192. Osmond, Donny
- 193. Otecko
- 194. Otep
- 195. Other Ones, The
- 196. Otherwise
- 197. Otilia
- 198. Otis Stacks
- 199. OTM, Marv
- 200. Otnicka
- 201. Otro Yo, El
- 202. Otsochodzi
- 203. Ott
- 204. Ott, Kerstin
- 205. Ottaviani, Giuseppe
- 206. Ottawan
- 207. Otto Dix
- 208. Ouboter, Maaike
- 209. Our Hollow, Our Home
- 210. Our Lady Peace
- 211. Our Last Night
- 212. Our Mirage
- 213. Oussama
- 214. Out of the Grey
- 215. OuterSpace
- 216. Outfield, The
- 217. OutKast
- 218. Outlandish
- 219. Outlawz
- 220. Outloud
- 221. Outsaiders, Los
- 222. OV7
- 223. Overdrive
- 224. Overkill
- 225. Overstreet, Paul
- 226. Overtime
- 227. Overtones, The
- 228. Ovy on the Drums
- 229. Owane
- 230. Owen
- 231. Owen, Jake
- 232. Owl City
- 233. Owl Vision
- 234. Ox, Matt
- 235. Oxmo Puccino
- 236. Oxxxymiron
- 237. Ozark Henry
- 238. Özbey, Merve
- 239. Ozcan, Ummet
- 240. Özel, Yaşar
- 241. Ozell, Sunny
- 242. Özen, Gökhan
- 243. Özen, Sinan
- 244. Özer, Zerrin
- 245. Özgün
- 246. Ozuna
- 247. O‐Town
- 248. O’Brien, Olivia
- 249. O’Connor, Sinéad
- 250. O’Donis, Colby
- 251. O’Donnell, Daniel
- 252. O’Jays, The
- 253. O’Neal, Alexander
- 254. O’Neal, Shaquille
- 255. O’Neill, Sharon
- 256. O’Riordan, Dolores
- 257. O’Sullivan, Gilbert