The diocese of Qui Nhơn (also referred to as the diocese of Quy Nhơn; Latin: Dioecesis Quinhonensis; Vietnamese: Giáo phận Qui Nhơn) is a Roman Catholic diocese in central Vietnam. The Bishop is Pierre Nguyên Soan, since 1999; Father Matthieu Nguyen Van Khoi, pastor of Assumption Cathedral in Quy Nhơn and professor at the "Maria Stella" Seminary of Nha Trang, was appointed Coadjutor Bishop-elect of the diocese by Pope Benedict XVI on December 31, 2009. He will be ordained at a later date; as coadjutor bishop to Bishop Soan, he serves as an auxiliary bishop and vicar general of the diocese but also, by canon law, has the right to automatically succeed him upon his death, retirement, or incapacitation.