The Catholic Diocese of Kitui is currently under the leadership of Rt. Rev. Joseph Mwongela, who serves as the Apostolic Administrator.
He was appointed Bishop of Kitui on 17th March 2020 and installed on 29th August 2020. He faithfully served the Diocese in this capacity until 4th January 2026, when he was appointed Coadjutor Bishop of the Catholic Diocese of Machakos. His reception took place on 19th March 2026 at Kenyatta Stadium. On the same day, the Apostolic Nuncio announced that Rt. Rev. Joseph Mwongela would continue serving as the Apostolic Administrator of the Diocese of Kitui until a substantive bishop is appointed.
On 27th May 2026, Pope Leo XIV appointed Monsignor John Mbua Mwandi as the fifth Bishop of the Catholic Diocese of Kitui. At the time of his appointment, he was serving as the Vicar General of the Diocese of Kitui and Father in Charge of Mulutu Parish. He is currently Bishop-elect, awaiting episcopal ordination and installation which will be communicated in due course.