The diocese of Presidio (Latin: Dioecesis Praesidiensis) is a suppressed and titular see of the Catholic Church.^[1]

Presidium, identifiable with ruins at Henchir-Somâa in present-day Tunisia, is an ancient episcopal seat of the Roman province of Byzacena.^[2]

There are two bishops known from this diocese.^{[3] [4]}

• The Leonatist a Donatist, who took part in the Carthage conference of 411, which brought together the Catholic and Donatist bishops of Roman North Africa.
• Fausto attended the synod gathered in Carthage by the Vandal king Huneric in 484, after which Fausto was exiled.

Today, Presidio survives as a titular see; the current titular bishop is Roger William Gries, former auxiliary bishop of Cleveland.

• Leonzio † (mentioned in 411) (Donatist bishop)
• Fausto † (mentioned in 484)
• Giuseppe Carata † (May 17, 1965 - April 8, 1967 appointed titular bishop of Canne)
• Władysław Miziołek † (19 February 1969 - 12 May 2000 deceased)
• Roger William Gries, since 3 April 2001