The 1956 1000 km Buenos Aires took place on 29 January, on the Autódromo Municipal-Avenida Paz, (Buenos Aires, Argentina). It was the third running of the race, and once again, it was opening round of the F.I.A. World Sports Car Championship. For this event, a longer section of the Autopista General Pablo Riccheri route was removed, returning the circuit to 9.476 km in length, as it was in 1954.