Nakhon Nayok City is a capital of Nakhon Nayok Province in the central region of Thailand.

The city (thesaban mueang) covers the whole tambon Nakhon Nayok and parts of Tha Chang, Ban Yai, Wang Krachom, and Phrom Ni of Mueang Nakhon Nayok district. In 2006 it had a population of 17,385. It lies 116 km northeast of Bangkok.