HàTây () was a former province of Vietnam, in the Red River Delta, now part of Hanoi.
Before being merged into Hanoi City on August 1, 2008, HàTây was subdivided into 14 district-level sub-divisions:
At the time, those were further subdivided into 22 commune-level towns (or townlets), 405 communes, and 26 wards.
The province was first created in 1967 and was dissolved in 1976 when it was merged with Hòa Bình Province into HàSán Bình Province. Its name HàTây was grafted from "HàÃÂông" and "Sán Tây", two old provinces in the Gulf of Tonkin.
The province was dissolved and both HàTây and Hòa Bình reverted into separate provinces on August 12, 1991.
On May 29, 2008 the decision was made to subsume HàTây into the city of Hanoi. The merger took place on August 1, 2008.