AG
- ag – (s) Attogram
- Ag – (s) Silver (Latin argentum)
- AG – (i) air gunner – Aktiengesellschaft (German, "incorporated") – (s) Algeria (FIPS 10-4 country code) – Antigua and Barbuda (ISO 3166 digram) – Assemblies of God
- AGA – (a/i) AB Gas-accumulator ("ah-gah", Swedish company) – Advanced Graphics Architecture
- AGARD – (a) Advisory Group for Aerospace Research and Development
- AGARDograph – (p) Advanced Guidance for Alliance Research and Development publication
- AGASA – (a) Akeno Giant Air Shower Array (cosmic ray detector)
- AGB – (i) Internal Nintendo initialism (Advanced Game Boy) for Game Boy Advance
- AGC – (i) Apollo Guidance Computer – Automatic Gain Control
- AGC – (i) Adjutant General's Corps (British Army)
- AGDC – (i) Australian Game Developers' Conference
- AGI – (i) Auxiliary Group Intelligence
- AGL – (i) Above Ground Level
- AGM – (i) Annual General Meeting
- AGN – (i) Active Galactic Nucleus
- AGO – (s) Angola (ISO 3166 trigram)
- AGP – (i) Accelerated Graphics Port
- AGRICOLA (a) Agriculture Online Access
- AGS – (i) Alaska Ground Station (LandSat)
- AGTS – (i) Advanced Gunnery Training System
- AGU – (i) American Geophysical Union
- AGW – (i) Autonomous Guided Weapon
Read more about this topic: List Of Acronyms And Initialisms: A