The 1959 Portuguese Grand Prix was a Formula One motor race held at Monsanto on 23 August 1959.

It was the eighth Portuguese Grand Prix and the second to be included in the World Championship of Drivers.

Wins in France and Germany had given Tony Brooks a healthy second place in the championship behind Jack Brabham.

Stirling Moss improved on his poor championship position with a dominating drive, lapping the entire field.

With Brabham failing to finish and Brooks finishing a distant five laps down in ninth, Moss closed the gap to just 9½ points behind Brabham and 5½ points behind Brooks in the championship race.