the roman catholic diocese of saint thomas in the virgin islands () is a diocese of the latin rite of the roman catholic church in the caribbean. the diocese comprises the overseas dependency of the u.s. virgin islands, specifically the islands saint thomas, saint croix and saint john. the diocese is a suffragan of the archdiocese of washington. bishops of saint thomas are members of the united states conference of catholic bishops and also enjoy observer status with the antilles episcopal conference.