| Bands by Letter: | O |
| O.A.R. | – | Oberhofer | – | Of Gentlemen & Cowards | – | Of Monsters and Men |
| Oh Jeremiah | – | Oh Mercy | – | Oh My! | – | Oh Pep! |
| Oh Wonder | – | OJR | – | OK Go | – | Old Man Canyon |
| Old Sea Brigade | – | Old Wave | – | Olly Murs | – | One Man Dancing |
| One11Twenty | – | OneRepublic | – | Only Seven Left | – | Only Yours |
| Opposite the Other | – | Opus Orange | – | Oques Grasses | – | Orphan Colours |
| Otherkin | – | Ottawa | – | Oxen | – | Oxford & Co. |
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