ARB may stand for:
In Medicine:
- Angiotensin receptor blocker (antagonist), a medication for treating high blood pressure
In the Military:
- Administrative Review Board, conduct annual hearings, to determine whether captives held in the Guantanamo Bay detention camps continue to represent a threat to the USA's national security
- Air Reserve base, a United States Air Force base converted for use by the Reserves
- A hull classification symbol, used for United States Navy battle damage repair ships
In Politics:
- Armee Revolutionnaire Bretonne (Breton Revolutionary Army), an armed Breton Nationalist secret society that has attacked France.
In Architecture:
- Architects Registration Board, for which see Architects Registration in the United Kingdom
In Science, Technology, and Engineering:
- Arbitrary unit
- Anti-roll bar, also known as a Sway bar
- ARB Project, for phylogenetic analysis
- Arbitron, a radio audience research company
- OpenGL Architecture Review Board, a consortium previously governing OpenGL
- ARB OpenGL Shader Assembly Language
In Transportation and Geography:
- Akawaio language (SIL code), a Cariban language of Guyana
- Several transportation facilities in Ann Arbor, Michigan:
- Ann Arbor Municipal Airport (IATA airport code)
- Ann Arbor train station (Amtrak station code)
- Arab States, UNESCO region
- Arbroath railway station, United Kingdom (National rail code)
- Arth-Rigi-Bahn, a Swiss mountain railway
In Government:
- Administrative Review Board (Labor) - a unit of the U.S. Department of Labor
- Air Resources Board, California Environmental Protection Agency
In Finance, Economics, or Business, "ARB" or "arb" may also be an abbreviation for:
- Arbitrage
- Arbitrage betting
- Arbitrary
- Arbitration
- Arb (gesture), a system of hand gestures used most notably on the Chicago Mercantile Exchange
In Music:
- ARB (band), a Japanese rock band
In Sports:
- Australian Racing Board, the peak national administration body for Thoroughbred racing in Australia
In Radio:
- American Research Bureau
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