Chaiyo ไชโย
District
Big Buddha of Wat Chaiyo Worawihan [th] Wat Ban Pa, Chaiyo [th] Wat Sai Nikhotharam [th] Wat Kamphaeng, Chaiyo [th]
District location in Ang Thong province
Coordinates: 14°38′57″N 100°28′43″E / 14.64917°N 100.47861°E / 14.64917; 100.47861
Country	Thailand
Province	Ang Thong
Area
• Total	72.3 km2 (27.9 sq mi)
Population  (2005)
• Total	22,882
• Density	320/km2 (820/sq mi)
Time zone	UTC+7 (ICT)
Postal code	14140
Geocode	1502

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

The name Ban Chaiyo dates back to when King Naresuan the Great and his brother, who later became King Ekathotsarot, defeated the King of Lan Na and Burmese soldiers in this area. The soldiers of Ayutthaya shouted Chaiyo (ไชโย, "hurrah") to celebrate.

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

Neighbouring districts are (from the north clockwise): Phrom Buri of Sing Buri province, Tha Wung, and Mueang Lopburi of Lopburi province; Ban Phraek and Maha Rat of Ayutthaya province; and Mueang Ang Thong and Pho Thong of Ang Thong Province.

The district is divided into nine sub-districts (tambons), which are further subdivided into 56 villages (mubans). There are two townships (thesaban tambons) in the district. Chorakhe Rong covers tambons Chorakhe Rong, Chaiyaphum, Lak Fa, Chawai, Tri Narong, and parts of Chaiyarit. Tambon Chaiyo is completely covered by the township Ket Chaiyo..