| Carlos Lacoste | |
| Office: | President of Argentina (Interim) |
| Term Start: | 11 December 1981 |
| Term End: | 21 December 1981 |
| Appointer: | Military junta |
| Vicepresident: | None |
| Predecessor: | Horacio Tomás Liendo (acting) |
| Successor: | Leopoldo Galtieri |
| Birth Date: | 1929 2, df=yes |
| Birth Place: | Buenos Aires, Argentina |
| Death Place: | Buenos Aires, Argentina |
| Spouse: | Hebe Angélica Aprile |
| Profession: | Military |
| Signature: | Carlos Lacoste Firma.jpg |
Carlos Alberto Lacoste (2 February 1929–24 June 2004) was an Argentine navy vice-admiral and politician who briefly served as interim President of Argentina.
In addition to a naval career, Lacoste undertook the organization of the 1978 FIFA World Cup, hosted by Argentina. In December 1981 the then head of state General Roberto Viola was ousted in a coup d'état. Lacoste served as interim President of Argentina from 11 to 22 December 1981, during a period of military rule. He was succeeded in the presidential office by Lieutenant General Leopoldo Galtieri. After the military government, he preserved his connections with football associations, becoming a South American representative in FIFA, and in 1986 he was assigned as Argentine supervisor in the drawing of that year's World Cup matches in Mexico, which was eventually won by Argentina. He died on 24 June 2004 at the age of 75.