Yên Bái is a city in Vietnam. It is the capital of Yên Bái Province, in the north-east region of Vietnam. The city borders Yên Bình District and Trấn Yên District. The city is a settlement along the banks of the Red River, approximately 183 km northwest of Hanoi. It is one of the important trading hubs between the highlands and the lowlands of Northern Vietnam.

Yên Bái is a province located in Tây Bắc, the northern part of northern-central Vietnam. It shares borders with six provinces which are Hà Giang province, Lào Cai province, Lai Châu province, Sơn La province, Phú Thọ province, and Tuyên Quang province. The province covers an area of about 6,893 km2 (2,661 sq mi) and as of 2022 it had a population of 847,250 people.