| Honorific-Prefix: | The Most Reverend |
| Birth Place: | Quảng Bình province, Vietnam |
| Religion: | Catholic |
| Previous Post: | Apostolic Administrator of Hưng Hóa (2020-2022) |
| Alma Mater: | Vinh Thanh Major Seminary Catholic College of Education Sydney |
| Coat Of Arms: | COA Bishop Peter Nguyen Van Vien, Vinh, Vietnam.jpg |
| Birth Date: | 8 January 1965 |
| Consecrated By: | Paul Nguyễn Thái Hợp, Joseph Nguyễn Năng, Michael Joseph McKenna |
| Pierre Nguyễn Văn Viên | |
| Province: | Hà Nội |
| Native Name: | Phêrô Nguyễn Văn Viên |
| Native Name Lang: | vi |
| Auxiliary Bishop of Vinh Titular Bishop of Megalopolis in Proconsulari | |
| Diocese: | Vinh |
| See: | Megalopolis in Proconsulari (titular) |
| Consecration: | 4 September 2013 |
| Appointed: | 15 June 2013 |
| Enthroned: | 4 September 2013 |
| Ordination: | 3 October 1999 |
| Motto: | Pacem Meam do vobis (My peace I give unto you) (Thầy ban cho anh em bình an của Thầy) |
Pierre Nguyễn Văn Viên is a Vietnamese Roman Catholic prelate, serving as Auxiliary Bishop of the Roman Catholic Diocese of Vinh,[1] Titular Bishop of the Megalopolis in Proconsulari (Titular See) and Apostolic Administrator of the Roman Catholic Diocese of Hưng Hóa, Vietnam.[2] [3] [4]
Nguyen was born in Quảng Bình province, Vietnam on 8 January 1965. He served in the army as a mandatory service. He acquired a doctorate in economics from the University of Agronomy, Hue.
On 3 October 1999, Nguyen was ordained a priest. After ordination, he worked in Australia among Vietnamese immigrants. He acquired his doctorate in theology in Australia.
Nguyen was appointed Auxiliary Bishop of the Roman Catholic Diocese of Vinh and Titular Bishop of the Megalopolis in Proconsulari (Titular See) on 15 June 2013 and consecrated as a bishop on 4 September 2013 by Bishop Paul Nguyễn Thái Hợp. He was appointed Apostolic Administrator of the Roman Catholic Diocese of Hưng Hóa on 29 August 2020