The Diocese of Ogoja () is a Latin Church ecclesiastical territory or diocese of the Catholic Church in Nigeria. It is a suffragan diocese in the ecclesiastical province of the metropolitan Archdiocese of Calabar, yet still depends on the missionary Roman Congregation for the Evangelization of Peoples.
Its cathedra is Saint Benedict Cathedral, dedicated to diocesan patron saint Saint Benedict, in the episcopal see of Ogoja, in Cross River State.
As per 2014, it pastorally served 902,975 Catholics (32.5% of 2,779,037 total) on 12,557 km<sup>2</sup> in 65 parishes with 99 priests (96 diocesan, 3 religious), 50 lay religious (3 brothers, 47 sisters) and 137 seminarians.