Wikipedia
PJO
PJO may refer to:
- Percy Jackson and the Olympians, a Rick Riordan book series
- Politieke Jongeren Organisaties (PJO), a Dutch political youth organization
- Pacific Journal of Optimization, Pacific Optimization Research Activity Group
- Pakistan Journal of Ophthalmology
Music groups:
- Pavia Jazz Orchestra, music group based in Uruguay
- Portland Jazz Orchestra
- Philadelphia Jazz Orchestra
- Pittsburgh Jazz Orchestra