The Galatian War is a war between the Galatian Gauls and the Roman Republic supported by their allies Pergamum in 189 BCE.

The war is fought in Galatia in central Asia Minor, in present day Turkey.The Romans had just defeated the Seleucids in the Roman-Syrian War and had forced them to thereby sue for peace.

Following their recently successful operation in Syria, the Romans now turn their attention towards the Gallic tribes of Galatia who had emigrated to Asia Minor almost 100 years prior to the ensuing military engagement.

Gnaeus Manlius Vulso, the consul, excuses the invasion by saying that it is in retaliation for the Galatians supplying troops to the Seleucids during the war.

Vulso embarks on this campaign without the permission of the Roman Senate.

Joined by Pergamum, the Romans march inland and attack the Galatians,defeating them in a battle on Mount Olympus and following up the victory by defeating a larger army near Ankara.These defeats forced the Galatians to sue for peace and the Romans return to the coast of Asia Minor.

However, when Manlius Vulso returns to Rome, he is charged with threatening the peace between the Seleucids and Rome.

He is cleared and was granted a triumph by the Senate.