| Type: | Cardinal |
| Honorific Prefix: | His Eminence |
| Auguste-René-Marie Dubourg | |
| Archbishop of Rennes | |
| Church: | Roman Catholic Church |
| Archdiocese: | Rennes |
| See: | Rennes |
| Appointed: | 6 August 1906 |
| Term End: | 22 September 1921 |
| Predecessor: | Joseph-Guillaume Labouré |
| Successor: | Alexis-Armand Charost |
| Other Post: | Cardinal-Priest of Santa Balbina (1916-21) |
| Ordination: | 22 December 1866 |
| Consecration: | 16 April 1893 |
| Consecrated By: | Pierre-Marie-Frédéric Fallières |
| Cardinal: | 4 December 1916 |
| Created Cardinal By: | Pope Benedict XV |
| Rank: | Cardinal-Priest |
| Birth Name: | Auguste-René-Marie Dubourg |
| Birth Date: | 1 October 1842 |
| Birth Place: | Loguivy-Plougras, French Kingdom |
| Death Place: | Rennes, French Third Republic |
| Buried: | Rennes Cathedral |
| Previous Post: | Bishop of Moulins (1893-1906) |
| Motto: | Per Matrem ad cor Filii |
| Coat Of Arms: | Blason Mgr Dubourg.png |
| Cardinal Name: | Auguste Dubourg |
| Dipstyle: | His Eminence |
| Offstyle: | Your Eminence |
Auguste-René-Marie Dubourg (1 October 1842—22 September 1921)[1] was a French Cardinal of the Roman Catholic Church. He served as Archbishop of Rennes from 1906 until his death, and was elevated to the cardinalate in 1916.
Auguste Dubourg was born in Loguivy-Plougrasto two inn-keepers[2] and studied at the seminary in Saint-Brieuc before being ordained to the priesthood on 22 December 1866. He then taught at the Minor Seminary of Saint-Brieuc, and served as secretary of the episcopal curia, vicar general, and vicar capitular of Saint-Brieuc.
On 19 January 1893, Dubourg was appointed Bishop of Moulins by Pope Leo XIII. He received his episcopal consecration on the following 16 April from Bishop Pierre-Marie-Frédéric Fallières, with Bishops François-Marie Trégaro and Etienne-Marie Potron, OFM, serving as co-consecrators, in Saint-Brieuc Cathedral.
Dubourg was later promoted to Archbishop of Rennes on 6 August 1906.[3] Pope Benedict XV created him Cardinal Priest of S. Balbina in the consistory of 4 December 1916.
The Cardinal died in Rennes, at age 79. He is buried in the metropolitan cathedral of Rennes.