The 2003 Spanish Grand Prix (formally the XLV Gran Premio Marlboro de España) was a Formula One motor race held on 4 May 2003 at the Circuit de Catalunya in Montmeló, Spain.

It was the fifth round of the 2003 Formula One season and the forty-fifth Spanish Grand Prix, and also the last held on this layout.

The 65-lap race was won by Michael Schumacher in a Ferrari car after starting from pole position.

Fernando Alonso finished second driving for the Renault team with Rubens Barrichello third in the other Ferrari.

Ralph Firman scored his one and only point by finishing eighth.