AGL may refer to:
- A Graphics Language, a high level language to control early HP plotters
- Abergele and Pensarn railway station, United Kingdom, from its National Rail code
- Above ground level, in aviation
- Adobe Glyph List
- Artificial grammar learning
- Apple Graphics Library, an OpenGL API for the Apple Macintosh systems
- AGL Resources
- Atlanta Gas Light, its subsidiary
- AGL Energy Limited (after 25 October 2006)
- Australian Gas Light Company (until 25 October 2006)
- Automatic Grenade Launcher