Peter Dai Bui

Peter Dai Bui (born January 11, 1970) is a Vietnamese-born American Catholic prelate serving as auxiliary bishop of the Diocese of Phoenix in Arizona since 2026.

Biography Early life Bui, along with 48 relatives and neighbors, as photographed by Eddie Adams during their 1977 escape from Vietnam.

Bùi Đại was born on January 11, 1970, on the island of Phú Quốc, in what was then South Vietnam.

Deciding to enter the priesthood, Bui entered the Legion of Christ's novitiate in 1989. During that time, he studied at the minor seminary in Cheshire, Connecticut and made his first profession of vows in 1991.

Priesthood Bui was ordained a priest for the Legion of Christ on December 24, 2003. While a Legion of Christ priest, he served as the chaplain of a Catholic high school in Caracas, Venezuela. He also organized international mission trips to Amazonia and Medellín, Colombia. He later became associate pastor at Christ the King Parish (Mesa) from 2008 to 2010. During his term there, he was officially incardinated a priest of Phoenix in 2009. Due to his service at Cor Unum and the recommendation of Cardinal Robert Sarah, Bui was named a Chaplain to His Holiness by Pope Francis on December 16, 2014, receiving the title Monsignor. While serving in Rome, Bui helped arrange a 2015 meeting between Pope Francis and the Harlem Globetrotters.

Following his return from Rome, Bui was appointed theological consultant to the bishops of Phoenix in 2017. He was also made pastor at Holy Spirit Parish (Tempe) that year and served there until 2022, when he began his role as vicar for clergy for the diocese.

On November 15, 2022, Bui led a prayer vigil at St. Mary's Basilica to abolish the death penalty in Arizona. This service took place the evening before Murray Hooper's execution.

Auxiliary Bishop of Phoenix On December 19, 2025, Pope Leo XIV appointed Bui as auxiliary bishop of Phoenix and titular bishop of Ausafa. He is only the second auxiliary in Phoenix's history, following Bishop Eduardo Nevares. He also became the fifth Vietnamese American bishop. He will continue to serve as Vicar for Clergy while auxiliary bishop. The Mass was celebrated by Bishop John P. Dolan, with the assistance of Auxiliary Bishop Nevares and Bishop emeritus Olmsted.

Personal life Bui is fluent in many languages, including Spanish, German, Italian, English, and Vietnamese.