The diocese of Caltadria () is a suppressed and titular see of the Roman Catholic Church.Le Grand dictionnaire géographique, et critique (1737).Apostolische Nachfolge – Titularsitze .
The location of the bishopric's original cathedra is now lostCaltadria at gcatholic.org. but it was in today's Algeria, and is recorded of the Roman province of Mauretania Caesariensis during late antiquity.Caltadria at catholic-hierarchy.org.Pius Bonifacius Gams, Series episcoporum Ecclesiae Catholicae, (Leipzig, 1931), p.464.Stefano Antonio Morcelli, Africa Christianity Volume I, (Brescia, 1816), pp. 116–117.
The only known bishop of this diocese is Victor, who took part in the synod assembled in Carthage in 484 by the Vandal King Huneric, after which Victor was exiled. Today Caltadria survives as a titular bishopric and the current bishop is Janusz Ostrowski, of Warmia, Poland.
Known bishops Victor fl.484 Josip Mrzljak 1998–2007 César Daniel Fernandez 2007–2012 Gregory Bittman 2012–2018Audiences, 27.03.2017. Janusz Ostrowski 2018–current
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