=== Under
Nguyễn lords === An Giang was the former territory of
Chân Lạp. In 1757,
Cambodia's King
Nặc Đôn (Ang Tong) died. The regent Nặc Nhuận paid his two prefectures:
Trà Vinh and
Ba Thắc as tribute to
Lord Võ to get approval as the new king of Cambodia. Afterward, Nặc Nhuận's son-in-law killed him to ascend the crown. Nặc Đôn's grandson,
Nặc Tôn (Ang Ton) fled to Hà Tiên seeking for military aid.
Lord Võ appointed Nặc Tôn as the new king of Cambodia and ordered
Mạc Thiên Tứ and his troops to escort Nặc Tôn back. In return, Nặc Tôn ceded the
Tầm Phong Long region to Lord Võ. Lord Võ divided this region to three sub-regions:
Châu Đốc, , and
Đông Khẩu, under the administration of . === Under
Nguyễn dynasty === In 1808, Emperor
Gia Long renamed Lower
Cochinchina from
Gia Định trấn to
Gia Định thành, its four palaces (
dinh): Phiên Trấn, Trấn Biên, Trấn Định, Vĩnh Trấn (Long Hồ) were also renamed to protectorate (
trấn): Phiên An, Biên Hoà, Định Tường, Vĩnh Thanh respectively. Định Viễn district was renamed to Định Viễn prefecture. An Giang province was first established in 1832 when Emperor
Minh Mạng divided Lower
Cochinchina into
Six Provinces. An Giang province contained two prefectures: Tân Thành,Tuy Biên, divided into four districts: Vĩnh An, Vĩnh Định, Đông Xuyên, and Tây Xuyên. was appointed the governor-general of
An – Hà (An Giang – Hà Tiên) cum viceroy of Chân Lạp. Under Cương administration were: Ngô Bá Nhân – An Giang provincial governor, and Phạm Xuân Bích - Hà Tiên provincial governor, both were apointed before. ===
2025 Merger === On June 12, 2025, the National Assembly passed Resolution No. 202/2025/QH15, which took effect the same day, merging
Kiên Giang Province into An Giang Province. == Etymology ==