| Borges de Medeiros | |
| Honorific-Suffix: | GOONM |
| Office: | President of Rio Grande do Sul |
| Term Start: | 25 January 1913 |
| Term End: | 25 January 1928 |
| Predecessor: | Carlos Barbosa Gonçalves |
| Successor: | Getúlio Vargas |
| Term Start2: | 25 January 1898 |
| Term End2: | 25 January 1908 |
| Predecessor2: | Júlio de Castilhos |
| Successor2: | Carlos Barbosa Gonçalves |
| Office3: | Member of the Chamber of Deputies |
| Term Start3: | 6 July 1935 |
| Term End3: | 10 November 1937 |
| Constituency3: | Rio Grande do Sul |
| Term Start4: | 15 November 1890 |
| Term End4: | 31 December 1892 |
| Constituency4: | Rio Grande do Sul |
| Birth Date: | 19 November 1863 |
| Birth Place: | Caçapava do Sul, Rio Grande do Sul, Brazil |
| Death Place: | Porto Alegre, Rio Grande do Sul, Brazil |
| Party: | PRR (1882–1937) UDN (1945–1961) |
| Father: | Augusto César de Medeiros |
| Mother: | Miguelina de Lima Borges |
| Alma Mater: | Faculty of Law of Recife |
| Occupation: | Editor of A Federação |
| Allegiance: | Brazil |
| Serviceyears: | 1893–1895 |
| Rank: | Lieutenant colonel |
| Battles: | Federalist Revolution |
Antônio Augusto Borges de Medeiros (19 November 1863 – 25 April 1961) was a Brazilian lawyer, judge, and politician. He served as Chief Judge and was appointed as the President of Rio Grande do Sul for a total of 25 years (1898–1908 and 1913–1928), during the period of Brazilian history known as the República Velha.[1] He "inherited" the presidency from Júlio de Castilhos, the local dictator against whom the 1893 Federalist Revolution had been fought.[2] Supporters of Borges de Medeiros were known as borgistas.[3]
Medeiros was born in Caçapava do Sul. He ran in the presidential election of 1934, but was defeated by President Getúlio Vargas. He died in Porto Alegre, aged 97.