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
• 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

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