GCM
GCM is an abbreviation for:
- Galois / Counter Mode , an operating mode for authentically encrypting block ciphers, see also Authenticated Encryption
- General Circulation Model , see Climate Model #Global Climate Models - GCM (General Circulation Model)
- Global Compact for Safe, Orderly and Regular Migration , treaty of the United Nations
- Owen Roberts International Airport , Cayman Islands Airport (IATA code)
