The Roman Catholic Diocese of Pesto (or Paëstum or Pæstum) was a bishopric and remains a Latin Catholic titular see.
The diocese was established around 400 AD in Pesto, the Italian name of the Ancient Greco-Roman city of Paestum.
In gained territory in 600 from the suppressed Diocese of Agropoli and again in 750 from the suppressed Diocese of Sala Consilina.
In 1100 it lost territory to establish the Roman Catholic Diocese of Capaccio (presently Vallo della Lucania).
As the city declined and was to be abandoned, the bishopric was suppressed in 1160, its territory being reassigned to its daughter, the Diocese of Capaccio.
(very incomplete; all Roman Rite)
The diocese was nominally restored as a Latin Catholic titular bishopric in 1966.
It has had the following incumbents, both of the fitting lowest (episcopal) and intermediary (archiepiscopal) ranks :