| Acronym | Definition |
|---|
| IPO | Initial Public Offer(ing) (new stocks) |
| IPO | Intellectual Property Office |
| IPO | Intellectual Property Owners Association (Washington, DC USA) |
| IPO | Interprovinciaal Overleg (Netherlands) |
| IPO | Illinois Periodicals Online |
| IPO | International Programs Office (US Navy) |
| IPO | Intellectual Property Organization |
| IPO | Israel Philharmonic Orchestra |
| IPO | Illustrative Purposes Only |
| IPO | Integrated Program Office |
| IPO | International Project Office |
| IPO | Investing Pays Off (Merrill Lynch) |
| IPO | Input Process Output |
| IPO | International Program Office (US DoD) |
| IPO | International Permanent Observatory (on Security During Major Events; UNICRI) |
| IPO | Interdecadal Pacific Oscillation (ocean current named in 1999) |
| IPO | Instituto Português de Oncologia (Portugese: Portugese Institute of Oncology) |
| IPO | IGES/PDES Organization |
| IPO | International Procurement Office |
| IPO | International Purchasing Office |
| IPO | International Progress Organization |
| IPO | Indian Postal Order |
| IPO | Inter Procedural Optimization (Intel C++ Compiler) |
| IPO | In-Place-Optimization |
| IPO | Input, Processing, and Output (requirements of a program) |
| IPO | International Police Organization |
| IPO | Internal Purchase Order |
| IPO | Industrial Property Officer (NASA) |
| IPO | Improved Pregnancy Outcome |
| IPO | Institutional Program Office |
| IPO | Iterative Physical Optics |
| IPO | Instrument Project Office |
| IPO | Independent Practice Organization |
| IPO | Individual Performance Objective |
| IPO | International Press Organization |
| IPO | Industrial Partnership Office |
| IPO | Individual Pays Own (meeting planning) |
| IPO | Internet Protocol Over Optical (IETF) |
| IPO | International Pasta Organisation |
| IPO | International Pact Organization |
| IPO | Information Protection Office (USAF) |
| IPO | Indice Pollution Organique (French: topographical index of organic pollution of water) |
| IPO | Instrumental Performing Organization (The Hartt School, University of Hartford, West Hartford, CT) |
| IPO | Internet Powered by Oracle |
| IPO | Industrial Preparedness Operations |
| IPO | Initial Phase Onset |
| IPO | Industry Portfolio Office (Canada) |
| IPO | Indirect Program Office |
| IPO | Integrated Product Ownership (defense program management) |
| IPO | In-Process Overview |
| IPO | Intervening Protection Optical (Pirelli) |
| IPO | Indian Intellectual Property Office |
| IPO | International Powerlifting Organization |
| IPO | Information Programs Office (US State Department) |