| Planetary-Mass Object | Academic & Science |
| Periodic Mesoporous Organosilicas | Academic & Science |
| Pressure Maximum Operating | Academic & Science |
| Palermo | Airport Code |
| PUTNAM Municipal Opportunities Trust | Business |
| Property Management Office | Business |
| Project Management Oversight | Business |
| Pandemic Management Order | Business |
| Premier Oil | Business |
| Program Management Offices | Business |
| Project Management Operations | Business |
| Prospective Management Overseas | Business Management |
| Project Management Offices | Business Management |
| Project Management and Operations | Business Management |
| Polymethylene Oxide | Chemistry |
| Pacific Mambo Orchestra | Community |
| Purdue Musical Organizations | Community |
| Policy Management Object | Computing |
| Present Mode of Operation | Computing |
| Portmaster Office Router | Computing |
| Post Modern Outreach | General |
| Peace Making Office | General |
| A Power Milk Operation | General |
| Packing Many Ovules | General |
| Parents Morning Out | General |
| Phosphorodiamidate Morpholino Oligomer | General |
| Public Mutual Online | General |
| Purple Mountain Observatory | General |
| Pine Mountain Observatory | General |
| Piss Me Off | General |
| Porn Masturbation Orgasm | General |
| Performance Motor Oil | General |
| Premium Motor Oil | General |
| Price Momentum Oscillator | General |
| Purdue Music Organization | General |
| Painful Meaningless Overhead | General |
| Primary Milking Operations | General |
| Private Mark Out | General |
| Participating Member Organization | General |
| Passing Muscat Outbound | Governmental |
| Pasteurized Milk Ordinance | Governmental |
| Project Management Officer | Governmental |
| Pakistan Missile Organization | Governmental |
| Polish Military Organisation | Governmental |
| Priority Material Office | Governmental |
| Project Managment Office | Governmental |
| Prime Minister's Office | Governmental |
| Putnam Municipal Opportunities | Governmental |
| Prime Minister Office | Governmental |
| PANDOLI | Indian Railway Station |
| Principal Medical Officer | Military and Defence |
| Production Management Office(r) | Military and Defence |
| Preventive Maintenance Optimization | Military and Defence |
| Provost Marshal Office | Military and Defence |
| Project Management Office | Military and Defence |
| Program Management Office | Space Science |
| Premier Oil plc | Stock Exchanges |
| Falcone–Borsellino Airport | Transport & Travel |
| Pandoli Railway Station | Transport & Travel |
