The 1957 1000 km Buenos Aires took place on 20 January, on the Circuito de la Costanera Norte,. It was the fourth running of the race, and once again, it was opening round of the F.I.A. World Sports Car Championship. For this event, was moved from its previous venue, the Autódromo Municipal-Avenida Paz, only to return to the Autódromo in 1958.

The 1957 World Sportscar Championship season was the fifth season of the FIA World Sportscar Championship. It was a series for sportscars that ran in many worldwide endurance events. It ran from 20 January 1957 to 3 November 1957, and comprised seven races.