Chai Nat (Thai: ชัยนาท; from Sanskrit Jayanāda जयनाद, "resounding of victory") can refer to:
- Chai Nat Province, a province in Central Thailand
- Chai Nat, a town in Chai Nat Province
- Mueang Chai Nat District, the main district of Chai Nat Province
- Rangsit Prayurasakdi, also known as Prince of Chai Nat
- Chai Nat (city), an ancient city in present-day Phitsanulok Province
See also
- Jainad mandal, mandal in Telangana, India
- André Julien Chainat, French World War I flying ace
