The 1945 Copa Aldao was the final match to decide the winner of the Copa Aldao, the 16th edition of the international competition organised by the Argentine and Uruguayan Associations together. The final was contested by Uruguayan club Peñarol and Argentine side River Plate.

The Copa Ricardo Aldao, popularly called Campeonato Rioplatense and Copa Río de La Plata, was an official AFA-AUF football club competition contested annually, albeit irregularly, between the league champions of Argentina and Uruguay. The trophy was donated by Argentine football executive Ricardo Aldao (1863–1956), who would later become president of the Argentine Football Association.