| Will Oakland |
| Will Oakland and the American Quartet |
| Will Oakland and Billy Murray |
| Ocean Grove Auditorium Choir |
| Neil O'Brien and James J. Corbett |
| Knut Öhrström |
| Chauncey Olcott |
| King Oliver's Creole Jazz Band |
| King Oliver's Jazz Band |
| Original Crescent City Jazzers |
| Original Dixieland Jazz Band |
| Original New Orleans Jazz Band |
| The Original Six Brown Brothers |
| The Original Wolverines |
| Original Tuxedo Jazz Orchestra |
| Oriole Quartette |
| Nicholas Orlando's Orchestra |
| Ory's Sunshine Orchestra |
| Ory's Sunshine Orchestra and Roberta Dudley |
| Ory's Sunshine Orchestra and Ruth Lee |
| Vess L. Ossman |
| Vess L. Ossman and William Parke Hunter |
| Ossman-Dudley Trio |
| Original Memphis Five |
