| Jurisdiction: | Diocese |
| Border: | Catholic |
| Gumaca | |
| Latin: | Diocesis Gumacana |
| Local: | Diyosesis ng Gumaca Spanish; Castilian: Diócesis de Gumaca |
| Coat: | File:Diocese of Gumaca Coat of arms.svg |
| Coat Size: | 150px |
| Country: |  Philippines |
| Metropolitan: | Lipa |
| Territory: | Eastern Quezon Province (Alabat, Buenavista, Calauag, Catanauan, General Luna, Guinayangan, Gumaca, Lopez, Macalelon, Mulanay, Perez, Pitogo, Quezon, San Andres, San Francisco, San Narciso, Tagkawayan) |
| Province: | Lipa |
| Coordinates: | 13.9214°N 122.0994°W |
| Denomination: | Roman Catholic |
| Sui Iuris Church: | Latin Church |
| Rite: | Roman Rite |
| Established: | April 9, 1984 |
| Patron: | Didacus of Alcalá |
| Area Km2: | 3,666 |
| Population: | 1,059,760 |
| Population As Of: | 2021 |
| Catholics: | 902,270[1] |
| Bishop: | Sede Vacante |
| Metro Archbishop: | Gilbert Armea Garcera |
| Apostolic Admin: | Ramon D. Uriarte |
| Vicar General: | Ramon D. Uriarte |
The Roman Catholic Diocese of Gumaca (Lat: Dioecesis Gumacana) is a Roman Catholic diocese in the Philippines centered in the Municipality of Gumaca in Quezon province. The Roman Rite Latin Church diocese covers the communities of Gumaca; Pitogo, due south of Gumaca; and all the parishes of eastern Quezon province situated east of Gumaca and Pitogo. The Gumaca diocese was erected in 1984, carved out from the Diocese of Lucena. Both dioceses are suffragan of the Archdiocese of Lipa.
| 1. | Emilio Zurbano Marquez | 15 Dec 1984 - 4 May 2002 | |
| 2. | Buenaventura Malayo Famadico | 11 Jun 2003 - 25 Jan 2013 | |
| 3. | Victor C. Ocampo | 3 Sep 2015–16 March 2023 | |