| Acronym | Definition |
|---|
| PEO | Professional Employer Organization |
| PEO | Philanthropic and Educational Organization for Women (PEO International) |
| PEO | Polyethylene Oxide |
| PEO | Professional Engineers Ontario |
| PEO | Progressive External Ophthalmoplegia (genes) |
| PEO | Parliamentary Education Office (Australia) |
| PEO | Public Education and Outreach (various organizations) |
| PEO | Postsecondary Education Opportunity (research newsletter) |
| PEO | Program Executive Office |
| PEO | Product Engineering Optimizer |
| PEO | Performing Engineering Operations (UK) |
| PEO | Prevention, Education and Outreach (healthcare) |
| PEO | Pan-Cyprian Labor Federation (Cyprus) |
| PEO | Publish Everything Online |
| PEO | Professional Engineers of Oregon |
| PEO | Pacific Economic Outlook |
| PEO | Protect Each Other |
| PEO | Pigs Eat Onions |
| PEO | Promoting Educational Opportunities |
| PEO | Pay Equity Office (Canada) |
| PEO | Peace Enforcement Operation (includes peace keeping operations) |
| PEO | Polar Earth Orbit |
| PEO | Planning Engineers Organisation |
| PEO | Plant Equipment Operator |
| PEO | Physical Education Officer (UK) |
| PEO | Program Executive Office/Officer |
| PEO | Primer Estado Oculto (Spanish: Hidden First State; cryptographic protocol) |
| PEO | Project Executive Office/Officer |
| PEO | Plant Emergency Organization |
| PEO | Program Enrichment Office |
| PEO | Personnel Executive Officer |
| PEO | Pentagon Engineering Office/Officer |
| PEO | Product Engineering Office/Officer |
| PEO | Program Evaluation Office/Officer |
| PEO | Product Engineering Organization |
| PEO | Pre-Existing Ordering |