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, Italy, with the race taking place on Easter Sunday. It was the fourth round of the 2003 Formula One season The 62-lap 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. The remaining points-scoring positions were filled by Ralf Schumacher (Williams), David Coulthard (McLaren), Fernando Alonso (Renault), Juan Pablo Montoya (Williams) and Jenson Button (BAR). Schumacher's victory for Ferrari was his and the team's first of the season.

The 2003 FIA Formula One World Championship was the 57th season of FIA Formula One motor racing. It featured the 2003 Formula One World Championship for Drivers and the 2003 Formula One World Championship for Constructors, which were contested concurrently over a sixteen-race series that commenced on 9 March and ended on 12 October.