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- Z: A to Z of services
- O'Brien, Tony (Music Tutor)
- Oak Community Church (Charismatic Church) - St Pauls Cray
- Ockendon, Hugh (Music Tutor)
- Oregon Park Residents Association
- Orpington and District Archaeological Society (O.D.A.S.)
- Orpington and District Caledonian Society (Scottish Dancing)
- Orpington and District Model Railway Society
- Orpington Art Club
- Orpington Astronomical Society
- Orpington Baptist Church
- Orpington Baptist Church Youth Groups
- Orpington Bridge Club
- Orpington Chorale
- Orpington Community Mental Health Team
- Orpington Floral Art Society
- Orpington Folk Club
- Orpington Folk Dance Group
- Orpington History Organisation
- Orpington Library Rooms
- Orpington Methodist Church
- Orpington Symphony Orchestra
- Orpington Video and Film Makers
- Orpington Village Hall
- Orpington Warren Road Thi Shotokan Karate
- Our Lady of the Rosary Church (Catholic) - Hayes