IPSO may refer to:
- International Programme on the State of the Ocean IPSO
- Les Intellectuels pour la souveraineté — a group of intellectuals studying and promoting Quebec independence.
- Ipso, meso, and peri substitution Arene substitution patterns in organic chemistry
- Nokia IPSO — operating system for Nokia IP Security Platforms.
- IPSO Alliance
- International Public Services Organisation, a European trade union, related to Union Network International-Europa-Finance which is member of UNI global union and of Global Unions.