Humberto "Cacho" Costantini (April 8, 1924 – June 7, 1987) was an Argentine writer and poet whose work was influenced by Buenos Aires slang (porteño).

Costantini was born in Buenos Aires, the only child of Italian Jewish immigrants who lived in the barrio of Villa Pueyrredon.

In his student days he confronted the Fascists of the Alianza Libertadora Nacionalista and was a member of the Communist Party until serious differences of opinion with the bureaucratic and pro-Soviet leadership caused him to leave it.

[2] An admirer of Osvaldo Pugliese, Anibal Troilo ("Pichuco"), and Eduardo Arolas, Constantini was a Tango singer, dancer, and amateur historian.

[3] His unfinished work, Rapsodía de Raquel Liberman, recounts the exploits of a Jewish prostitute enslaved by the sinister organization Zwi Migdal who ultimately leaves that life behind her.