| 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
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.