| Jurisdiction: | Diocese |
| Border: | Catholic |
| San Fernando de La Unión | |
| Latin: | Dioecesis Ferdinandopolitana ab Unione |
| Local: | Diócesis ti San Fernando de La Union Diyosesis ng San Fernando de La Union Diócesis de San Fernando de La Unión |
| Coat: | Diocese of San Fernando Coat of Arms.svg |
| Coat Size: | 150px |
| Country: | Philippines |
| Territory: | La Union |
| Province: | Lingayen-Dagupan |
| Metropolitan: | Lingayen-Dagupan |
| Coordinates: | 16.6158°N 120.3175°W |
| Area Km2: | 1,493 |
| Population: | 853,600 |
| Population As Of: | 2021 |
| Catholics: | 730,300[1] |
| Denomination: | Catholic Church |
| Established: | 19 January 1970 |
| Cathedral: | Cathedral-Parish of St. William the Hermit |
| Patron: | William the Hermit Our Lady of Namacpacan |
| Bishop: | Daniel Oca Presto |
| Metro Archbishop: | Socrates B. Villegas |
| Suffragan: | for one --> |
| Archdeacon: | for one--> |
| Website: | dioceseofcabanatuan.org |
The Diocese of San Fernando de La Union (Latin: Dioecesis Ferdinandopolitana ab Unione) is a Latin Church ecclesiastical territory or diocese of the Catholic Church in the Philippines. The diocese was established in 1970 from the Archdiocese of Nueva Segovia.[2] It is a suffragan in the ecclesiastical province of the metropolitan Archdiocese of Lingayen-Dagupan.
| No. | Name | From | Until | Coat of Arms | ||
|---|---|---|---|---|---|---|
| 1 | Victorino Cristobal Ligot | 6 Feb. 1970 | 18 Sept. 1980 | |||
| 2 | Salvador Lazo Lazo | 20 Jan. 1981 | 28 May 1993 | |||
| 3 | Antonio Realubin Tobias | 28 May 1993 | 25 Nov. 2003 | |||
| 4 | Artemio Lomboy Rillera, SVD | 1 Apr. 2005 | 13 Nov. 2011 | |||
| Sede Vacante - Apostolic Administrator | Socrates B. Villegas, DD | 13 Nov. 2011 | 19 Jan. 2013 | |||
| 5 | Rodolfo Fontiveros Beltran | 19 Jan. 2013 | 17 Jun. 2017 | |||
| Sede Vacante - Apostolic Administrator | Victor B. Bendico, DD | 17 June 2017 | 02 Aug. 2018 | |||
| 6 | Daniel Oca Presto | 2 Aug. 2018 | present | |||