The 1955 Argentine Grand Prix was a Formula One motor race held at Buenos Aires on 16 January 1955. It was race 1 of 7 in the 1955 World Championship of Drivers and the third running of the Argentine Grand Prix. It was also the first of three international races within two weeks, with the 1955 1000 km Buenos Aires opening the sports cars WC season, and the 1955 Buenos Aires Grand Prix Formula Libre race at the end of January seeing another win for Fangio and Mercedes, this time powered by the enlarged 3.0 sports car version of the F1 engine.