Agat or AGAT may refer to:

• Agat, Burma, a village in Ayeyarwady Region, Burma
• Agat, Eritrea, a railway station in Eritrea
• Agat, Guam, a village in Guam
• Agat (computer), Soviet 8-bit computer
• Agat (given name), Russian masculine first name
• Uru Harbour Airport, an airport in Atoifi, Solomon Islands
• JW Agat, a unit of the Polish Special Forces
• AGAT, an abbreviation for arginine:glycine amidinotransferase, an enzyme
• AGAT, an abbreviation for O-6-methylguanine-DNA methyltransferase, a protein