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The diocese of Mibiarca (in Latin: Dioecesis Mibiarcensis) is a suppressed and titular see of the Catholic Church, in today's Tunisia. It is an ancient episcopal seat of the Late Roman province of Byzacena.
The only known bishop of this African diocese was John, who participated in the anti-monotheistic council of Carthage (641).
Today Mibiarca survives as a titular diocese established in 1933. Its initial bishop was Marcelo Gérin y Boulay, the Prelate of Choluteca in Honduras, who was appointed in 1966. The current titular bishop is Thomas Padiyath, who was appointed in 2022 and who is an auxiliary bishop of the Syro-Malabar Eparchy of Shamshabad in India.
| Name | Sui iuris church | Appointed | Concomitant appointment | Term end | Notes |
|---|---|---|---|---|---|
| Marcelo Gérin y Boulay | Latin Church | 30 Dec 1966 | Prelate of Choluteca, Honduras | 29 Aug 1979 | Appointed, Bishop of Choluteca |
| Emilio Ogñénovich | Latin Church | 1 Oct 1979 | Auxiliary Bishop of Bahía Blanca, Argentina | 8 Jun 1982 | Appointed, Bishop of Mercedes, Argentina |
| José Oscar Barahona Castillo | Latin Church | 16 Jul 1982 | Auxiliary Bishop of San Vicente, El Salvador | 6 Jun 1983 | Appointed, Bishop of San Vicente |
| Luis Morgan (Aloysius) Casey | Latin Church | 3 Nov 1983 | Auxiliary Bishop of La Paz, Bolivia | 27 Jul 2022 | Died in office as Vicar Apostolic Emeritus of Pando, Bolivia |
| Thomas Padiyath | Syro-Malabar Church | 25 Aug 2022 | Auxiliary Bishop of Shamshabad, India | present | incumbent |
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