APR or Apr may refer to:

• Annual percentage rate, the interest rate computed for an entire year
  • The term includes the nominal APR and the effective APR

• Agrarian Party of Russia, a left-wing political party in Russia
• Alabama Public Radio
• Algarve Pro Racing, Portuguese auto racing team
• American Public Radio, now Public Radio International
• Andy Petree Racing, stock car auto racing team
• Appian Publications & Recordings
• Armée Patriotique Rwandaise FC, Rwandan association football club
• APR BBC, a Rwandan basketball club
• Asia Pacific Rayon, Indonesian-based viscose-rayon producer
• Asia-Pacific Scout Region (World Organization of the Scout Movement)
• Apr (racing team), Japanese auto racing team

• Acoustic paramagnetic resonance, a resonant absorption effect used in magnetic resonance spectroscopy
• Acute phase reaction, a reaction due to the presence of inflammatory allergens
• Advanced port replicator, a docking device
• Ammonium perrhenate, a compound of rhenium
• Apache Portable Runtime, a library for the Apache web server
• ARP poison routing, spoofing of the address resolution protocol (ARP)
• Brügger & Thomet APR, the Advanced Precision Rifle, a Swiss sniper rifle
• The APR-1400 and APR+ advanced pressurized reactor, a series of South Korean pressurized water nuclear reactors
• Air-Purifying Respirator
• Automatic program repair
• Automated Pain Recognition

• Abdominoperineal resection
• Academic Progress Rate, an NCAA (National Collegiate Athletic Association) guideline
• Accreditation in Public Relations
• Acute phase reactant, a class of proteins
• Adleman–Pomerance–Rumely primality test to check whether a given number is prime
• African Peer Review Mechanism, an African Union self-monitoring mechanism
• Alberta Prairie Railway Excursions
• Alternative Press Review, a left-wing American political magazine
• April, as an abbreviation for the fourth month of the year in the Gregorian calendar
• The Chief Scouts' Advance Party Report, a review of Scouting that took place in the UK in 1966
• A retired US Navy hull classification symbol: Convoy rescue craft (APR)