Ham Long Church is a Roman Catholic church in the center district Hoan Kiem of Hanoi, Vietnam. The church was built at the end of the 19th century near an old street named Ham Long from which Ham Long Church was called. Today, Ham Long Church is one of the three major churches of Hanoi, together with Cua Bac Church and Saint Joseph Cathedral.
At the end of the 19th century, a Roman Catholic church was erected near the Doudart de Lagrée Street of Hanoi. This was an historic street of the Old Quarter of Hanoi with the former name Hàm Long, so the church was more commonly known as the Ham Long Church. The actual church was built in 1934 after the design of a Vietnamese architect, at the time of the French administration. In this street there is also aBuddhist pagoda of the same name, Ham Long Pagoda (Chùa Hàm Long), but its history was dated from the 11th century.