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
- 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
The Agat was a series of 8-bit computers produced in the Soviet Union. It wasn't a clone of Apple II with some modifications, it was only partially compatible with Apple. Commissioned by the USSR Ministry of Radio, for many years it was a popular microcomputer in Soviet schools. First introduced at a Moscow trade fair in 1983, the Agat was primarily produced between 1984 and 1990, although a limited number of units may have been manufactured as late as 1993.
Agat is a Russian male first name. While "Agat" is simply a Russification of certain Western European names (all of which derive from the Greek word agathos, which means good, kind), it was also one of the newly created names documented in the 1920s and 1930s, given after agate, a semi-precious stone.