ARL may refer to:
Military A US Navy hull classification symbol: Landing craft repair ship (ARL) 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 Arriva Rail London, operators of London Overground rail services
Computing Authority revocation list, in cryptosystems
Other Argyll, historic county in Scotland, Chapman code ADP-ribosylation factor-like protein, as in ARL3, ARL8A, ARL8B