| 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 | – | Okey Dokey |
| 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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