| Jurisdiction: | Archdiocese |
| Thare and Nonseng | |
| Latin: | Archidioecesis Tharensis et Nonsengensis |
| Local: | Thai: อัครสังฆมณฑลท่าแร่-หนองแสง |
| Country: |  Thailand |
| Province: | Thare and Nonseng |
| Area Km2: | 25,477 |
| Population: | 3,171,478 |
| Population As Of: | 2010 |
| Catholics: | 44,078 |
| Catholics Percent: | 1.4 |
| Denomination: | Catholic |
| Sui Iuris Church: | Latin Church |
| Rite: | Roman Rite |
| Cathedral: | Cathedral of St Michael the Archangel in Tha Rae |
| Cocathedral: | Co-Cathedral of St Anne in Nakhon Phanom |
| Bishop: | Anthony Weradet Chaiseri |
| Bishop Title: | Archbishop |
| Map: | Thailand Diocese Thare and Nonseng.png |
The (Roman Catholic) Archdiocese of Thare and Nonseng (Archidioecesis Tharensis et Nonsengensis; Thai: อัครสังฆมณฑลท่าแร่-หนองแสง,) is located in the north-east of Thailand. It is based in Tha Rae, a subdistrict municipality (thesaban tambon) in the Mueang Sakon Nakhon district.
The diocese covers an area of 25,477 km², covering four provinces of Thailand - Kalasin, Mukdahan, Nakhon Phanom and Sakon Nakhon. As of 2001, of the 3.1 million citizen 49,489 are member of the Catholic Church. It is divided into 30 parishes, having 51 priests altogether. By December 31, 2006, the archdiocese had 51,275 Catholics, 1.61 percent of the territory's population.
3 dioceses are suffragans of the archdiocese:
The archdiocese traces its origin back to the Vicariate Apostolic of Laos, which was established on May 4, 1899, responsible for all of what is now northeast Thailand and modern-day Laos. The seat of the vicariate was at Ban Nonseng, Nakhon Phanom Province. In 1938 the northern part was split off to create the Prefecture Apostolic of Vientiane and Luang-Prabang. After the independence of Laos in 1949 the vicariate was divided: on December 21, 1950, the Laotian part was split off to create the Prefecture Apostolic of Thakhek, while the Thai part became the Vicariate Apostolic of Thare. In 1960 it was renamed the Vicariate Apostolic of Thare and Nonseng, and was promoted as the Archdiocese of Thare and Nonseng on December 18, 1965.
The St. Michael the Archangel Cathedral is located in Ban Tha Rae, Tha Rae subdistrict, Mueang Sakon Nakhon district, at the northern shore of the Nong Han Lake, 17.2542°N 104.1842°W.
Before Thare and Nonseng became a diocese, the administrator had the title vicar, but was also a titular bishop. The ordinary was raised to Archbishop on 18 December 1965.
February 12, 1959 - March 6, 1980
March 6, 1980 - May 14, 2004
July 1, 2005 - May 13, 2020
May 13, 2020 - present