PSP
- AACE International
- AMD Platform Security Processor
- Excoriation disorder
- PSPS (disambiguation)
- Pacifist Socialist Party
- PaintShop Pro
- Pak Sarzameen Party
- Palm Springs International Airport
- Parallel slave port
- Paralytic shellfish poisoning
- Parker Solar Probe
- Partido Socialista Popular (Cuba)
- Payment service provider
- Państwowa Straż Pożarna
- Pennsylvania State Police
- People's Services Party
- Personal Public Service Number
- Personal software process
- Phenolsulfonphthalein
- Philippine Sign Language
- Photostimulable phosphor plate
- Physical Security Professional
- Pierced steel planking
- PlayStation Portable
- PlayStation Portal
- Pneumatic stabilized platform
- Polydiethylstilbestrol phosphate
- Polysaccharide peptide
- Polícia de Segurança Pública
- Popular Socialist Party (Argentina)
- Popular Socialist Party (Haiti)
- Popular Socialist Party (Mexico)
- Popular Socialist Party (Spain)
- Postsynaptic potential
- Pounds, shillings, and pence
- Praja Socialist Party
- President's Surveillance Program
- Pressure-sensitive paint
- Primary spine practitioner
- Program Segment Prefix
- Progress Singapore Party
- Progressive Socialist Party
- Progressive Socialist Party of Ukraine
- Progressive Sudanese Party
- Progressive supranuclear palsy
- Public Sector Pension Investment Board
- Puerto Rican Socialist Party
- Python Server Pages
- Socialist Party of Chile