Joseph-Marie Ndi-Okalla is a Cameroonian Catholic prelate who serves as bishop of the Roman Catholic Diocese of Mbalmayo, in Cameroon since 27 December 2016. Before that, from 13 August 1983 until 27 December 2016, he was a priest of that same Catholic See. He was appointed by Pope Francis. He was consecrated by Piero Pioppo, Titular Archbishop of Torcello, on 18 February 2017, at Mbalmayo.

The Archdiocese of Douala, in Cameroon. He attended elementary school near his home area. He then studied at the Mbalmayo Minor Seminary. He studied for one year at the Notre Dame de l'Immaculée Conception Interdiocesan Major Seminary, in Nkolbisson, Yaoundé.

He was then sent to France to continue his priestly education there. He started out at the "Séminaire universitaire des Carmes" of the Catholic University of Paris. He then transferred to the Paris-Sorbonne University, where he studied Theology, History and Civilisation. At Sorbone University, he earned a Master's degree in Biblical Theology and Systematics. His Doctorate in Dogmatic Theology was awarded by the University of Bonn in Germany.

He has also been a panelist for the LSRS Diversity Day event in June 2026.