Chai Nat (Thai: ชัยนาท, pronounced [t͡ɕʰāj nâːt]) is a town (thesaban mueang) in central Thailand, capital of Chai Nat province.

[1] It covers the whole tambon tambon Nai Mueang and parts of Ban Kluai, Tha Chai and Khao Tha Phra, all in Mueang Chai Nat district.

The town is on the banks of the Chao Phraya River.

The main road through the town is Phahonyothin Road (Highway 1).

Bangkok lies 188 km to the south.