Name
- Ord, Boris, organist, 1897-19611
- Orga, Ates D'Arcy, musicologist1
- Orr, Robin Kemsley, composer1
- Orrey, Gilbert Leslie, writer on music and music educationalist1
- Ovenden, Lionel H., organist and composer, 1894-19761
- Oxenbury, William, musicologist1
- Oxford University Press, University of Oxford, 1486-1
- Roberts, William, alias 'Ernest Newman', music critic, 1868-19591