A-Z of Services
- Oakland (Rochdale)
- Ocean Recovery Centre
- Office G6, Lock 50 Business Centre
- OFSTED (Office for Standards in Education)
- The Old Library After School Club
- The Old Library Before School Club
- The Old Library Private Day Nursery
- Oldham Audiology Hearing Assessment and Hearing Aid
- Oldham College
- Oldham GP Federation
- Oldham Police Station
- Oldham Road Pharmacy
- One Dental
- OO Test
- OO TEST Carescheme
- Open Britain
- The Open University
- Open Young Minds
- Oral Health for the elderly programme
- Oral Health Promotion Unit
- Orkid Ideas - TomTag
- Oulder Hill Community School
- Our Lady and St Paul's Roman Catholic Primary
- Out There - Supporting families of prisoners
- Owls After School (St Michael's Bamford)