Ang Thong (Thai: อ่างทอง, pronounced [ʔàːŋ tʰɔ̄ːŋ]) or Angthong is one of the central provinces (changwat) of Thailand. The name "Ang Thong" means 'gold basin', thought to have derived from the basin-like geography of the area, and the golden color of the rice grown in the region.

Neighboring provinces are (from north clockwise) Sing Buri, Lopburi, Ayutthaya, and Suphan Buri.

Ang Thong native handicrafts include moulded court dolls, firebrick, and wickerwork.

Ang Thong has more than 200 Buddhist temples, but there are nine distinct temples that are promoted as "Paying Homage to Nine Auspicious Temples". This consists of Wat Chaiyo Worawihan [th], Wat Khun Inthapramun [th], Wat Pa Mok Worawihan, Wat Tonson [th], Wat Mahanam, Wat Thasutthawat, Wat Siroi, Wat Khian and, Wat Muang [th] where the Great Buddha of Thailand is enshrined.

Ang Thong occupies a low river plain, created by the Chao Phraya and the Noi Rivers. It has neither mountains nor forests, but consists of mostly agricultural land. The two rivers, together with many canals (khlongs), provide enough water for rice farming.

Ang Thong was historically known as Wiset Chai Chan, on the Noi River. It was an important border town of the Ayutthaya Kingdom during the wars with Burma, as the Noi River served as a natural obstacle for advancing troops.

During the reign of King Taksin after the fall of Ayutthaya, the main city of the province was moved to the Chao Phraya River, and named Ang Thong, as the Noi River had become silted and too shallow for transportation.

Ang Thong is the provenance of Likay, the native folk song, and the hometown of Nai Dok and Nai Thongkaeo, two heroes of the Bang Rachan Battle.