| Jurisdiction: | Diocese |
| Port Harcourt | |
| Latin: | Dioecesis Portus Harcurtensis |
| Country: | Nigeria |
| Territory: | Rivers State |
| Province: | Calabar |
| Metropolitan: | Archbishop of Calabar |
| Deaneries: | 8 deaneries |
| Coordinates: | 4.7772°N 7.0133°W |
| Area Km2: | 21,850 |
| Population: | 4,521,429 |
| Population As Of: | 2004 |
| Catholics: | 218,412 |
| Catholics Percent: | 4.8 |
| Parishes: | 159 |
| Schools: | 1 Tertiary Institution (CIWA), 1 Minor Seminary (Sacred Heart Seminary), 15 Secondary Schools and 44 Primary Schools |
| Denomination: | Catholic Church |
| Sui Iuris Church: | Latin Church |
| Rite: | Roman Rite |
| Established: | May 16, 1961 |
| Cathedral: | Corpus Christi Cathedral in D-line, Port Harcourt |
| Priests: | 157 |
| Bishop: | Most Rev. Camillus Archibong Etokudoh Bishop of Port Harcourt |
| Suffragan: | for one --> |
| Auxiliary Bishops: | Patrick Eluke |
| Vicar General: | Rev. Msgr. Cyprian Onwuli |
| Archdeacon: | for one--> |
| Map: | Nigeria Rivers State map.png |
| Website: | www.catholicdioceseofportharcourt.org |
The Diocese of Port Harcourt (Latin: Portus Harcurten(sis)) is a Latin Church ecclesiastical territory or diocese of the Catholic Church in Nigeria. The episcopal see is Port Harcourt, Rivers State. The Diocese of Port Harcourt is in the ecclesiastical province of metropolitan Archdiocese of Calabar.
The diocesan cathedral is Corpus Christi Cathedral located in D-line, Port Harcourt.