The new archbishop is replacing Cardinal Paul Joseph Pham Ðình Tung, 85, now retired.
Archbishop Quang Kiêt, 52, was ordained a priest in 1991, and was bishop of Lanson and Cao Bang since 1999. He had been also the apostolic administrator in Hanoi since 2003.
Of the 6 million inhabitants of the Archdiocese of Hanoi, 5.1% are Catholics.
The Holy See also announced the appointment of Bishop François Xavier Le Van Hong as auxiliary bishop of the Archdiocese of Hue.
About 6 million of Vietnam's 82 million inhabitants are Catholic. About 50 million are Buddhists.