ARL may refer to: Military US Navy hull classification symbol for repair ship Admiralty Research Laboratory, UK United States Army Research Laboratory ARL 44, a WWII French tank Organizations Aero Research Limited, a UK adhesives company Air Resources Laboratory of US NOAA Association of Research Libraries, US and Canada Pennsylvania State University Applied Research Laboratory, US Animal Rescue League of Western Pennsylvania, US Sports Albanian Rugby League Auckland Rugby League Australian Rugby League Transportation Airport Rail Link (Bangkok), Thailand Autolinee Regionali Luganesi, Swiss bus company Arlesey railway station (National Rail code), UK Armour Refrigerator Line, a refrigerator car line Arly Airport (IATA airport code), Burkina Faso Computing Authority revocation list, in cryptosystems Other Argyll, historic county in Scotland, Chapman code