Organizations
- Aktiengesellschaft (AG), a German name for a corporation that is limited by shares, owned by shareholders, and may be traded in a stock market.
- Air Contractors (AG IATA code), a freight airline
- Assemblies of God (AG), the world's largest Pentecostal organization
- Action Group (Nigeria) (AG), a political party during the Nigerian First Republic
- Galveston Railroad (reporting mark)
- A&G Railroad (former reporting mark)
- Addleshaw Goddard, an English law firm
- American Girl, an American doll company originating in the United States
- Associated Group, a Pakistani company
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