ADR or adr may refer to:
Computing
- Asynchronous DRAM refresh, an approach for persistent memory found in some Intel Xeon processors
- The adr microformat, part of the hCard microformat
- Architectural decision record
- Action–domain–responder architectural pattern
- Advanced Digital Recording, a magnetic tape data storage format.
Science and medicine
- Adiabatic demagnetization refrigeration
- Adverse drug reaction
- Astra Digital Radio, a digital radio transmission system
- Artificial disc replacement, a surgical procedure
- Adrenodoxin-NADP+ reductase, an enzyme
Transportation
- ADR (treaty), a treaty governing transport of hazardous materials
- Accident data recorder, or flight data recorder
- Active Debris Removal, an action or policy for enhancing space transport safety
- Adria Airways, an airline of Slovenia
- Airdrie railway station, United Kingdom
- Ardeer railway station, Melbourne
- Robert F. Swinnie Airport, South Carolina, United States, by IATA code
Entertainment
- Automated dialogue replacement, a post-production process in filmmaking
- Alter Der Ruine, an American powernoise music group
Companies
- Applied Data Research, a large software vendor from the 1960s until the mid-1980s
Sports
- Alan Docking Racing, British motor racing team
- Alberto Del Rio (born 1977), Mexican professional wrestler
- AD Renting (cycling team), a Belgian professional cycling team that existed from 1987 to 1989
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
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
- Automotive dead reckoning, GNSS-assisted dead reckoning for vehicles
- Azerbaijan Democratic Republic (1918–1920), a precursor state to modern Azerbaijan
- Automated Demand response (Auto-DR), the automation by electric grid utilities to curtail load for various cost savings strategies.
- Axiom of real determinacy
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