Chai Badan (Thai: ชัยบาดาล, pronounced [t͡ɕʰāj bāː.dāːn]) is a district (amphoe) in the eastern part of Lopburi province, central Thailand.

Chai Badan was an ancient town in the Pa Sak River valley, controlled from Nakhon Ratchasima.

[5] Neighbouring districts are (from the east clockwise) Lam Sonthi, Tha Luang, Phatthana Nikhom, Khok Samrong and Khok Charoen of Lopburi Province, and Si Thep of Phetchabun province.

The Wang Kan Luang waterfall is the most visited place by Lopburi visitors.

The district is the site of a Royal Thai Air Force gunnery range.