St. Joseph's Cathedral (Nhà thờ Lớn) is a church on Nha Tho (Church) Street in the Hoàn Kiếm District of Hanoi, Vietnam. Its a late 19th-century Gothic Revival (Neo-Gothic style) church that serves as the cathedral of the Roman Catholic Archdiocese of Hanoi to nearly 4 million Catholics in the country.
Construction began in 1886, with the architectural style described as resembling Notre Dame de Paris. The church was one of the first structures built by the French colonial government in Indochina when it opened in December 1886. It is the oldest church in Hanoi.
