The Basilica of Immaculate Conception (Vietnamese: Vương cung thánh đường Phú Nhai) is a neo-Gothic Roman Catholic basilica in Phú Nhai, Xuân Trường, Nam Định, Vietnam.

One of the first two bishops of the Vietnamese Catholic church, Pierre Lambert de la Motte was also anointed in the diocese in 1670.

[2] The construction of the church began in 1866 after Emperor Tự Đức signed a treaty with the French promising not to harm the Christian community.

A nationwide lottery was conducted to fund the construction, and the replacement (third) church was consecrated on the day of the feast of Immaculate Conception on December 8, 1933.

In 2008, the church was elevated as a minor basilica by Pope Benedict XVI.