Wat Sing (Thai: วัดสิงห์, pronounced [wát sǐŋ]) is a district (amphoe) in the northern part of Chai Nat province, central Thailand.

Neighboring districts are (from the northeast clockwise) Manorom, Mueang Chai Nat, Hankha and Nong Mamong of Chai Nat Province; Nong Khayang and Mueang Uthai Thani of Uthai Thani province.

The district is divided into seven sub-districts (tambons), which are further subdivided into 47 villages (mubans).

Missing numbers are tambon which now form Nong Mamong District.

This Chainat Province location article is a stub.