Nacha Guevara (born Clotilde Acosta, October 3, 1940)[1] is an Argentine singer-songwriter, dancer, and actress from Mar de Plata, Buenos Aires province.

Trained as a dancer and actress, she discovered by chance a career as a singer becoming a symbol around 1968 in the avant-garde movement at Instituto Di Tella in Buenos Aires, the preeminent pioneer center for visual and theater experimentation at that time.

She was a controversial cult figure in the underground movement and as a singer-songwriter in the "café-concert" scene, singing tunes and parodies by Boris Vian, Georges Brassens, Tom Lehrer, Nicolas Guillén and Argentine writers including Julio Cortázar, Jorge de la Vega, Ernesto Schoo and others.

After the dress rehearsal prior to the opening night, a bomb destroyed the theater, killing a member of the crew and forcing her to flee the country once more.

On June 1, 2004, the newspapers announced Nacha's appointment as executive director of the Fondo Nacional de las Artes, a position that did not exist in the Fund's organizational chart.