| Jurisdiction: | Diocese |
| Sivagangai | |
| Latin: | Dioecesis Sivagangaiensis |
| Local: | Hindi: சிவகங்கை மறைமாவட்டம் |
| Country: | India |
| Territory: | Ramanathapuram and Sivagangai |
| Metropolitan: | Archdiocese of Madurai |
| Coordinates: | 9.8468°N 78.4792°W |
| Area Km2: | 8,353 |
| Area Footnotes: | [1] |
| Population: | 3,123,623 |
| Population As Of: | 2021 |
| Catholics: | 182,150 |
| Catholics Percent: | 5.8 |
| Parishes: | 82 |
| Schools: | 160 |
| Rite: | Latin Rite |
| Cathedral: | Alangara Annai Cathedral |
| Cocathedral: | Basilica of St. John de Britto |
| Patron: | John de Brito |
| Patron Title: | Saint |
| Priests: | 177 |
| Bishop: | The Most Reverend Lourdu Anandam |
| Bishop Title: | Bishop |
| Metro Archbishop: | Anthony Pappusamy |
| Archdeacon: | for one--> |
The Roman Catholic Diocese of Sivagangai is located at the southeast corner of Bay of Bengal, 45 km east of Madurai city, in Tamil Nadu, India.
It was established on July 25, 1987, bifurcated from the Archdiocese of Madurai. The Most Rev. S. Edward Francis was the First Bishop of the new Diocese and Bp. Jebamalai Susaimanickam succeeded him as the second bishop. On September 21st, 2023, The Most Rev. Dr. Lourdu Anandam was announced as the third bishop of the diocese, and his episcopal consecration took place on November 26th, 2023.
The territory of the diocese includes two civil districts Ramanathapuram and Sivagangai., the total population of the area is 2,502,340 of which the Catholic population is 182,150 (5.8%) and still growing. 20 years after the diocese has 62 parish centers, 734 mission stations about 107 diocesan clergy, 19 religious order priests and over 350 religious men and women serving at various religious and educational institutions in the diocesan region.
| Type: | bishop |
| Honorific Prefix: | The Most Reverend Dr. |
| Lourdu Anandam | |
| Bishop of Sivagangai | |
| Metropolis: | Archdiocese of Madurai |
| Diocese: | Diocese of Sivagangai |
| Predecessor: | Jebalamai Susaimanickam |
| Birth Date: | 15 August 1958 |
| Birth Place: | Thiruvarangam, India |
| Religion: | Roman Catholic |
| Alma Mater: | University of Freiburg |
First bishop was Edward Francis who served from 3 Jul 1987 until his retirement on 1 Sep 2005. He was succeeded by Rev Dr Jebamalai Susaimanickam, who served from 1 Sep 2005 until 25 Sep 2020 when he retired. The Most Rev. Dr. Lourdu Anandam is the third and current Bishop, having begun is term in 2023.