| Type: | Archbishop |
| Honorific-Prefix: | His Excellency |
| Joachim N'Dayen | |
| Archbishop Emeritus of Bangui | |
| Term Start: | 16 September 1970 |
| Term End: | 26 July 2003 |
| Predecessor: | Joseph Cucherousset |
| Successor: | Paulin Pomodimo |
| Previous Post: | Titular Archbishop of Culusi (1968–1970) |
| Ordination: | 22 July 1961 |
| Consecration: | 5 January 1969 |
| Consecrated By: | Luigi Poggi |
| Birth Date: | 1934 12, df=yes |
| Birth Place: | Loko, French Equatorial Africa |
| Death Place: | Paris, France |
Joachim N'Dayen (22 December 1934 – 13 June 2023) was a Roman Catholic archbishop in the Central African Republic. He was the archbishop of the Roman Catholic Archdiocese of Bangui, the capital city of the Central African Republic. He became archbishop on appointment by Pope Paul VI in September 1970, when he became the first Roman Catholic archbishop in the country. He resigned in 2003 and was replaced by Paulin Pomodimo. He presided over the Coronation Mass for Emperor Bokassa I in 1977.[1]
N'Dayen died in Paris on 13 June 2023, at the age of 88.[2]