Bosporus is a former bishopric in the Crimean city now called Kerch but remains a Latin Catholic titular archiepiscopal see.
The diocese dates from pre-schism Byzantine rule, persisted under Khazars rule but faded.
It was established in 1926 as a Titular archbishopric.
It is vacant, having the following Archiepiscopal (intermediary rank) incumbents :
This article about a Roman Catholic titular see in Europe is a stub.