The 15th Rome Grand Prix was a motor race, run to Formula One rules, held on 19 May 1963 at the ACI Vallelunga Circuit, near Rome in Italy. The race was run over two heats of 40 laps of the circuit, both of which were won by British driver Bob Anderson in a Lola Mk4. Swiss driver Jo Siffert was to have taken part in this race, having decided against competing in a sports car race in Germany on the same day. The team he was to have driven for, Ecurie Filipinetti, lobbied the Swiss Automobile Club and they refused Siffert a visa to race in Rome.