ADR or adr may refer to:
Aviation Accident data recorder, or flight data recorder Adria Airways, an airline of Slovenia Aeroporti di Roma, an Italian fixed-base operator of Rome Fiumicino Airport and Rome Ciampino Airport Robert F. Swinnie Airport in Andrews, South Carolina, US (IATA airport code ADR)
Companies Applied Data Research, a large software vendor from the 1960s until the mid-1980s
Computing Action–domain–responder architectural pattern The adr microformat, part of the hCard microformat Advanced Digital Recording, a magnetic tape data storage format Architectural decision record Asynchronous DRAM refresh, an approach for persistent memory found in some Intel Xeon processors
Entertainment Alter Der Ruine, an American powernoise music group Automated dialogue replacement, a post-production process in filmmaking
Law and finance Alternative dispute resolution American depositary receipt, a method of trading non-U.S. stocks on U.S. exchanges Average daily rate, a common lodging industry statistic
Science and medicine Adiabatic demagnetization refrigeration Adrenodoxin-NADP+ reductase, an enzyme Adverse drug reaction Artificial disc replacement, a surgical procedure Astra Digital Radio, a digital radio transmission system
Transportation Active debris removal, an action or policy for enhancing space transport safety ADR (treaty), governing transport of hazardous materials Airdrie railway station, UK Ardeer railway station, Melbourne
Sports AD Renting (cycling team), a Belgian professional cycling team that existed from 1987 to 1989 Alan Docking Racing, British motor racing team Alberto Del Rio (born 1977), Mexican professional wrestler Alice Davidson-Richards (born 1994), English cricketer
Other uses Académie de Roberval, a school in Montreal, Quebec, Canada Adonara language, a Central Malayo-Polynesian language of Indonesia ADR rose, a rose trial winner Alternative Democratic Reform Party, a political party in Luxembourg Australian Design Rules, a set of construction standards for road registered vehicles in Australia Automated Demand response (Auto-DR), the automation by electric grid utilities to curtail load for various cost savings strategies Automotive dead reckoning, GNSS-assisted dead reckoning for vehicles Axiom of real determinacy Azerbaijan Democratic Republic (1918–1920), a precursor state to modern Azerbaijan Automated dialogue replacement, process in film editing, see Dubbing#ADR/post-sync/over-dubbing