Chainsky District (Russian: Ча́инский райо́н) is an administrative[1] and municipal[4] district (raion), one of the sixteen in Tomsk Oblast, Russia.

It is located in the center of the oblast.

The area of the district is 7,242 square kilometers (2,796 sq mi).

[2] Its administrative center is the rural locality (a selo) of Podgornoye.

[7] The population of Podgornoye accounts for 38.6% of the district's total population.