Chau Thanh (Vietnamese: Châu Thành), is a district (huyện) of An Giang Province in the Mekong Delta region of Vietnam.
As of 2003 the district had a population of 171,480. The district covers an area of 347 km². The district capital lies at An Chau.
It was created when the district Châu Thành X was split into Chau Thanh and Thoai Son, under decree 300/CP on August 23 1979. Under South Vietnam, it was part of Long Xuyen province.
The district comprises the thị trấn An Châu (huyện lỵ) and 12 communes, which include a total of 63 hamlets. It borders four other districts, these being Tịnh Biên District, Châu Phú District, Chợ Mới, Thoại Sơn District and the nearby city of Long Xuyen.
The terrain is flat, and is bisected by the Hau River.
The ethnic groups in the area in order of size, are ethnic Vietnamese, Khmer Krom, Cham, and Hoa. Hoa Hao is the most common religion in the area.
Coordinates: 10°22′08″N 105°13′12″E / 10.36889°N 105.22000°E