ARL may refer to:
- Admiralty Research Laboratory, a UK military research laboratory.
- Aero Research Limited, a UK company involved in the development of aircraft adhesives.
- Air Resources Laboratory, an air quality and climate laboratory National Oceanic and Atmospheric Administration (NOAA).
- Airport rail link
- The Air Rail Link being constructed in Toronto, Canada.
- Airport Rail Link in Bangkok, Thailand.
- Akamai Resource Locator
- Alden Research Laboratory
- Amps for Running Load (an electrical rating, especially when motors are involved); this is also known as Amps for Full Load (AFL) or Full Load Amps (FLA)
- Amrita Research Labs
- Animal Rescue League of Iowa
- Animal Rescue League of Western Pennsylvania
- Applied Research Laboratories: see Claude Wendell Horton, Sr. and J. J. Pickle Research Campus.
- Arlesey railway station, United Kingdom, from its National Rail code.
- Armour Refrigerator Line
- Army Research Laboratory of the United States Army.
- Art Loss Register
- Associated Retailers Ltd, a retail group.
- Association of Research Libraries
- Auckland Rugby League, the city's administrative body for rugby league.
- Australian Rugby League, the nation's administrative body for rugby league.
- Authority revocation list
- Auxiliary Repair Light, a World War II US Navy hull classification symbol denoting a small craft repair ship.
- Aviation Research Laboratory