The 2003 San Marino Grand Prix was a Formula One motor race held on 20 April 2003 at the Autodromo Enzo e Dino Ferrari, Imola, Emilia-Romagna. It was the fourth round of the 2003 Formula One season.

The race was won by Ferrari driver Michael Schumacher for the Ferrari team after starting from pole position. Kimi Räikkönen, driving for McLaren, finished second with Rubens Barrichello third in the other Ferrari.

Schumacher and his brother Ralf raced despite the death of their mother Elisabeth before the Grand Prix. The brothers led the field at the start with Ralf leading having overtaken Michael and held the lead until the first round of pit stops.