PSP can mean:
It may also refer to:
- Payment Service Provider, a company which offers merchants the ability to accept payments
- Pacifist Socialist Party, a Dutch political party
- Palm Springs International Airport, IATA airport code
- Paralytic shellfish poisoning
- Pennsylvania State Police
- Personal Software Process
- Phi Sigma Pi, an honor fraternity in the United States
- Postal System Pinyin, a Chinese-language Romanization system
- Program Segment Prefix
- Progressive Socialist Party in Lebanon
- Progressive Supranuclear Palsy
- Puerto Rican Socialist Party
- Polícia de Segurança Pública, a Portuguese police force
- Python Server Pages, a web server facility of mod_python
- Philadelphia Songwriters Project
- Polysaccharide Peptide
- Pre-Integrated Solution Platform
- Pierced Steel Plank, airport runway cover
- Principal States of Polarization
- Per-survivor processing, a technique for communication receiver
- ProLiant Support Pack, a software and driver collection for HP ProLiant servers
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