OPS
- EPUB
- O. Panneerselvam
- OOPS (disambiguation)
- OP (disambiguation)
- OPPS (disambiguation)
- OPS-301
- Obscene Publications Squad
- Oceanic Preservation Society
- Off-premises station
- Office of Public Safety
- Old Pension Scheme
- On-base plus slugging
- Online portfolio selection
- Open Pluggable Specification
- Ops (disambiguation)
- Optical Pooled Screening
- Optical position sensor
- Orchestre philharmonique de Strasbourg
- Oriented polystyrene
- Orthogonal Polarization Spectral imaging
- Ottawa Police Service
- Oulun Palloseura
- Stock market
- Tea leaf grading