A-Z of Services
- Oakland (Rochdale)
- Oaklands House
- OCD UK
- Ocean Recovery 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
- Older People's Social Eating Group
- Oldham Audiology Hearing Assessment and Hearing Aid
- Oldham College
- Oldham GP Federation
- Oldham Integrated Care Centre (ICC)
- Oldham Police Station
- Oldham Road Pharmacy
- OLGBT Out and About Group - Age UK Oldham
- Once Upon a Smile
- One Dental
- The Open University
- Open Young Minds Project
- 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