Contact Information:
As there is no distinct chancery or vicariate office, and since the Apostolic Vicar resides and ministers there, contact or address all matters regarding the vicariate to the Church of Our Lady of the Assumption.

The Catholic Church in Brunei was formerly under the jurisdiction of the Diocese of Miri (then known as the Diocese of Miri-Brunei), in neighbouring Sarawak, East Malaysia. On 22 February 1998, by a papal decree issued in November 1997, the Church in Brunei was constituted an apostolic prefecture, with Msgr. Cornelius Sim as its first prefect. After seeing through 7 years of steady growth and maturity, the Holy See elevated the prefecture to an apostolic vicariate on 20 October 2004, with Msgr. Sim as the first vicar, carrying the dignity of a titular bishop.

The Catholic Church in Brunei comprises of three main parishes, namely the Church of Our Lady of the Assumption in the capital city of  Bandar Seri Begawan, St. John's Church in Kuala Belait and the Church of Our Lady of the Immaculate Conception in Seria. Besides the population in the main parishes, there are also a number of faithful in the districts of Temburong and Tutong.

The resident Catholic population is mainly ethnic Chinese as well as a good number from the several indigenous minorities. There is a sizeable transient population from the Philippines as well as from other parts of the world making up the bulk of the Catholic community.

At this present moment, the pastoral needs of the Church in Brunei are administered by 3 diocesan priests, with a seminarian under formation. There are also a number of pastoral workers working in the Vicariate.

The Franciscan Sisters of Sarawak used to work in the Vicariate and there was even one local sister from that congregation. Since her demise, there has only been one other local sister who is with the Franciscan Missionaries of Mary and currently serving in the USA.

The Church in Brunei is gradually coming to grips with its new-found identity, and strives to align itself with the needs of the local community while ensuring the carrying on of the mission of Christ in this country.