Biên Hòa (éÂÂÃ¥ÂÂ) ()) was a former province of Vietnam under the Nguyá» n dynasty and the South Vietnam. By June 2025, the original Biên Hòa corresponded areas of ÃÂá»Âng Nai province, BàRá»ÂaâÂÂVà ©ng Tàu province and Bình Phðá»Âc province with total area of over 17.000 km<sup>2</sup>.
In 1698, Lord Minh ordered Lá» Thành hầu establishing Gia ÃÂá»Ânh prefecture with two districts in Cao Miên territory: Phúc Long district based on ÃÂá»Âng Nai, protected by Trấn Biên palace; and Tân Bình district based on Sài Gòn, protected by Phiên Trấn palace.
In 1715, Phiên Trấn commander â Trần Thðợng Xuyên, and Trấn Biên deputy commander â Nguyá» n Cá»Âu Phú led Gia ÃÂá»Ânh forces to support Nặc Yêm (Ang Em) in defeating Nặc Thâm (Ang Tham) and retaking the La BÃÂch (Lavek) citadel. Lord Minh appointed Nặc Yêm as the new king of Cao Miên.
Biên Hòa province was first established in 1832 when Emperor Minh Mạng divided Lower Cochinchina into Six Provinces. Biên Hòa province contained one prefecture: Phðá»Âc Long, divided into four districts: Phðá»Âc ChÃÂnh, Phðá»Âc An, Bình An, and Long Thành.
By the 4th year under Tá»± ÃÂức (1851), Biên Hòa contained two prefectures: Phðá»Âc Long, and Phðá»Âc Tuy, dividing to seven districts: Phðá»Âc ChÃÂnh, Bình An, Phðá»Âc Bình, Nghéa An, Phðá»Âc An, Long Thành, and Long Khánh.
In 1876 it was split to Biên Hòa, Thủ Dầu Má»Ât and BàRá»Âa.
On October 22, 1956, it was split to Bien Hoa, Long Khánh, Phðá»Âc Long, Bình Long. On May 2, 1957, it contained four districts, Châu Thành Biên Hòa, Long Thành, Dé An and Tân Uyên. On January 23, 1959, Tân Uyên was separated and the rest became Phðá»Âc Thành province.
During Republic of Vietnam period, Biên Hòa hosted several ARVN critical bases like the III Corps Headquarters, the Long Bình Post, and the Biên Hòa Air Base.
The northernmost of Biên Hòa was also the southernmost of the Viet Cong War Zone D.