The initials AGB are used for:
- Advocate-General of Bengal
- AGB, a product code prefix for the Game Boy Advance, its software and accessories
- Alexander Graham Bell, Scots Canadian American inventor
- Amerika-Gedenkbibliothek, a library in Berlin, Germany
- Amsterdam Gençler Birliği, a Dutch football team
- Association of Governing Boards of Universities and Colleges
- Asymptotic giant branch, a category of stars
- Attorney General of Bangladesh
- Attorney-General of Barbados
- Attorney-General of Belize
- Attorney General of Bermuda
- Attorney General of Bhutan
- Attorney General of Brunei
- Authentic Brands Group, an American brand management company
- Ashley Gibson Barnett Museum of Art, formerly the Polk Museum of Art, in Lakeland, Florida, United States
- Gbo language (ISO 639-3 code AGB), Nigeria
- A US Navy hull classification symbol: Icebreaker (AGB)
Aviation
- IATA airport code for Augsburg airport in State of Bavaria, Germany