- Obstructions on roads or footpaths
- Occupational health
- Occupational Therapy
- OET
- Older people's homes
- Oldham Care Home Quality Standards
- Oldham Community Leisure website
- Oldham Credit Union
- Oldham District
- Oldham Enterprise Trust
- Oldham Foodbank
- Oldham Music Service & Music Centre
- Oldham Personal Advocacy Limited (OPAL)
- Oldham Safeguarding Adults Board (OASB)
- Oldham Virtual School
- Oldham’s Fair Employment Charter
- Online petitions
- Open access land
- Open data
- Opticians in Oldham
- Oral health
- Order a bulky waste collection
- Order, swap or repair bins
- Outdoor education
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