Computing

• Page address register
• .par and .par2, Parchive file types containing recovery data used to fix other files
• .par, file type associated with Solid Edge document
• Par (command), UNIX filtering command
• Positive acknowledgment with re-transmission, TCP/IP method of reliable data transmission

Culture

• Par contract, a bridge contract that results from optimal bidding by both sides and which neither side could improve by further bidding
• Par (golf scoring format), scoring format for golf used as an alternative to Stableford and stroke play
• Par (score), classification measure of each hole on a golf course that reflects the distance between the tee and green
• "Par Lenor", character played by Max Grodénchik in the Star Trek: The Next Generation episodes "The Perfect Mate" and "Captain's Holiday"
• Par-T-One, Italian electroclash band led by Sergione Casu and Andrea Pareo
• Par., an abbreviation of the Paralipomenon

Geography

• Khokhra Par (neighborhood), a neighborhood of Malir Town in Karachi, Sindh, Pakistan
• Par, Cornwall, a village in England, United Kingdom

Economics and organisations

• Aragonese Party (Spanish: Partido Aragonés or "PAR"), political party which advocates the interests of Aragon within Spain
• Haw Par Corporation, company responsible for Tiger Balm ointment, based in Singapore
• Pan Am Railways, commonly abbreviated as "PAR"
• Par Pharmaceutical, a manufacturer of generic drugs based in Woodcliff Lake, New Jersey, United States
• Par value, financial term for the value of a security
• Portuguese Association of Ryerson, Portuguese-Canadian Educational group
• Pull to par, financial economics concept

Science and technology

• Parabolic aluminumized reflector or "PAR light", a type of floodlight
• Participatory Action Research, research methodology
• Photosynthetically active radiation, measurement of the amount of photosynthetically active wavelengths in light
• Pixel aspect ratio, the aspect ratio of a single pixel in digital imaging and video
• Possible Allergic Reaction, warning accompanying some E number encodings for food additives
• Precision Approach Radar, military instrument approach system
• Pro Action Replay, brand of expansion cartridges for various home video game consoles
• Protease-activated receptor, cell receptor that is activated by cleavage
• Peak-to-average ratio
• Pseudoautosomal region, Homologous DNA sequences on X and Y chromosmes
• PAR the IATA airport code covering all airports in Paris, France