Horacio de la Peña (b. August 1 1966), nicknamed El Pulga (Spanish for "the flea"), is a tennis coach and a former tennis player from Argentina.

De la Peña was born in Buenos Aires. He began playing on the ATP circuit at age thirteen. His best singles ranking — achieved in 1987 — was number 31.

De la Peña was tennis coach of Chilean Fernando González until 2006, and was the unofficial (because of his nationality) captain of the Chilean Davis Cup team. He currently coaches Guillermo Coria.