Chaiyo (Thai: ไชโย, pronounced [t͡ɕʰāj.jōː]) is a district (amphoe) in the eastern part of Ang Thong province in Thailand.

The soldiers of Ayutthaya shouted Chaiyo (ไชโย, "hurrah") to celebrate.

When it was officially promoted to a district, the government selected the name "Chaiyo" because of its storied past.

The district is divided into nine sub-districts (tambons), which are further subdivided into 56 villages (mubans).

This Ang Thong province location article is a stub.