The Diocese of Sezze was a Latin Catholic bishopric with see in Sezze, in the Province of Latina, central Italy, about 65km (40miles) south of Rome and 10km (10miles) from the Mediterranean coast..
The Diocese of Sezze was established in 790 AD.
From 17 January 1217 it was in personal union (aeque principaliter) with the Diocese of Terracina, until both sees saw their titles and territories merged on 1986.09.30 into the Diocese of Latina–Terracina–Sezze–Priverno.
(all Roman Rite)
For further incumbents from 1217, see Diocese of Terracina, being identical due to personal union of their sees.