Mang Lang Church (in Vietnamese: Nhà thờ Mằng Lăng; French: Église de Mằng Lăng) is a Roman Catholic church in Vietnam, Phú Yên Province, 35 km from Tuy Hòa.
The church was built in 1892 by French missionary Father Joseph Lacassagne in gothic style. This place was the native village of blessed Andrew of Phu Yen beheaded in 1644. It is now an important shrine, as Andrew was declared Patron of the youth.
Alexander de Rhodes wrote here his Cathechismus in octo dies in Latin and Vietnamese (Quốc ngữ) and printed it in 1651.