AB, Ab, or ab may refer to:
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Business terminology
- Akcinė bendrovė, Lithuanian equivalent of an S.A. corporation
- Aktiebolag, Swedish for "corporation", similar to AG, Ltd or Inc
Businesses
- A & B High Performance Firearms, a defunct sporting firearms manufacturer
- AB Airlines, a defunct British airline
- AB Groupe, a French broadcasting group
- Activision Blizzard, American holding company for Activision and Blizzard Entertainment
- Air Berlin (former IATA airline code AB), a former airline
- Alderson-Broaddus College, a liberal-arts college in West Virginia, US
- Alfa-Beta Vassilopoulos, a Greek supermarket chain
- Allen-Bradley, a brand of industrial control products, manufactured by Rockwell Automation
- AllianceBernstein (New York Stock Exchange Symbol AB), a US-based asset management firm
- American Biograph (film logo AB), a former motion picture company
- Anheuser-Busch, a brewing company
- Bonza (IATA code AB), an Australian airline
- AB de Villiers (born 1984), South African middle order batsman and wicket-keeper
- Adrien Broner (born 1989), American Boxer, nicknamed AB
- Allan Border (born 1955), Australian cricketer, nicknamed A.B.
- Antonio Brown (born 1988), American football player, nicknamed AB