PSU may also refer to:
Universities:
- Pennsylvania State University
- Portland State University
- Pangasinan State University
- Palawan State University
- Partido State University
- Plymouth State University
- Pittsburg State University
- Plattsburgh State University
- Pembroke State University
- Prince of Songkla University
- Prince Sultan University
- Puntland State University
- Pacific States University
In entertainment:
- Public Surveillance Unit, a law enforcement organisation in the Judge Dredd comic strip
- Phantasy Star Universe, a persistent ORPG game by SEGA for PlayStation 2, Xbox 360 and PC
- Phantasy Star Universe: Ambition of the Illuminus, a persistent ORPG game by SEGA for PlayStation 2, Xbox 360 and PC.
- PlayStation Universe, a popular PlayStation website
In mathematics:
- Projective Special Unitary group - a mathematics projective unitary group
- Primary Sampling Unit - the highest level of sampling in a multi-stage or clustered design
Other Uses:
- Parti Socialiste Unifié (disambiguation), various organizations
- Passenger service unit
- Pilosebaceous unit
- Police Support Unit
- Polysulphone, plastic
- Port Security Unit, a U.S. Coast Guard expeditionary force protection unit.
- Power Supply Unit
- Power supply unit (computer)
- Practical salinity unit
- Prueba de Selección Universitaria, public university admission test in Chile
- Public Sector Undertaking, a term for Indian companies that have a majority stake from the Government of India