| Type: | Bishop |
| Honorific-Prefix: | His Excellency |
| Raphael Nguyễn Văn Diệp | |
| Coadjutor Bishop of Vĩnh Long | |
| Church: | Catholic |
| Province: | Hồ Chí Minh City |
| Diocese: | Vĩnh Long |
| See: | Tubusuptu |
| Appointed: | 15 August 1975 |
| Term End: | 27 May 2000 |
| Other Post: | Titular Bishop of Tubusuptu[1] (1975–2007) |
| Ordination: | 7 December 1954 |
| Consecration: | 15 August 1975 |
| Consecrated By: | Jacques Nguyễn Văn Mầu |
| Birth Date: | 20 October 1926 |
| Birth Place: | Long Thôi, French Indochina |
| Death Place: | Hồ Chí Minh City, Việt Nam |
| Motto: | Vigilate et orate (Watch and pray) |
Raphael Nguyễn Văn Diệp (20 October 1926 - 20 December 2007) was a Vietnamese bishop of the Roman Catholic Churchin Vietnam.
Raphael Diệp was born in Long Thôi in 1926. He was ordained a priest on 7 December 1954.
He was appointed titular bishop of Tubusuptu and coadjutor bishop of Vĩnh Long by Pope Paul VI. The appointment of a coadjutor bishop was due to the then difficult and unstable political situation in Vietnam.[2] He received his episcopal consecration from bishop Jacques Nguyễn Văn Mầu, on the same day of his appointment 15 August 1975.Despite initial fears, he never took over the government of the diocese. He continued serving the community as coadjutor bishop until 27 May 2000, when he retired due to reaching the age limit.[3] He died on 20 December 2007, aged 81.