| João Augusto de Araújo Castro | |
| Term Start: | 22 August 1963 |
| Term End: | 31 March 1964 |
| Successor: | Vasco Leitão |
| Birth Date: | 27 August 1919 |
| Birth Place: | Rio de Janeiro, Brazil |
| Death Place: | Washington, D.C., Unites States |
João Augusto de Araujo Castro (August 27, 1919, Rio de Janeiro – December 9, 1975, Washington, D.C.) was a Brazilian lawyer and diplomat, serving as Brazilian Ambassador to the US and UN, and Minister of Foreign Affairs during the government of João Goulart.