PSU

PSU may refer to:
 * Power supply unit, an electronic device
 * Power supply unit (computer)
 * Primary sampling unit, in sampling (statistics)

Entertainment

 * Phantasy Star Universe, a persistent ORPG game by SEGA for PlayStation 2, Xbox 360 and PC

Companies

 * Public sector undertakings in India, companies owned by government in India.

Political parties

 * Parti Socialiste Unifié (disambiguation), various parties
 * United Socialist Party (Bolivia), Bolivia (Partido Socialista Unificado)

Trade unions

 * Prudential Staff Union, former trade union in the UK

Universities

 * Pennsylvania State University
 * Portland State University
 * Pangasinan State University
 * Palawan State University
 * Partido State University
 * Pacific States 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

Other uses

 * Passenger service unit
 * Primary service unit, a cable TV subscriber metric
 * Personal Support Unit, a UK charity assisting individuals in court proceedings
 * Police Support Unit
 * Port Security Unit, a U.S. Coast Guard expeditionary force protection unit
 * Practical salinity unit, a unit for quantifying a fluid's salinity
 * Program Storage Unit, a chip as used e.g. in the Fairchild F8 microprocessor
 * Projective special unitary group, a mathematical quotient
 * Prueba de Selección Universitaria, public university admission test in Chile
 * Public Sector Undertaking, an Indian company with majority government ownership