| 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 |
| OneRepublic | – | Only Seven Left | – | Only Yours | – | Opposite the Other |
| Opus Orange | – | Oques Grasses | – | Orphan Colours | – | Otherkin |
| Ottawa | – | Oxen | – | Oxford & Co. | – | – |
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