The 1985 San Marino Grand Prix was a Formula One motor race held at Imola on 5 May 1985. It was the third race of the 1985 Formula One World Championship. The 60-lap race was won by local driver Elio de Angelis, driving a Lotus-Renault, after McLaren driver Alain Prost had been disqualified for being underweight. It was de Angelis' second and last win. Thierry Boutsen was second in an Arrows-BMW, with Patrick Tambay third in a factory Renault.