| Type: | NC |
| Country: | Italy |
| Grand Prix: | Syracuse |
| Official Name: | XII Gran Premio di Siracusa |
| Location: | Syracuse Circuit, Syracuse, Sicily |
| Date: | 25 April |
| Year: | 1963 |
| Course: | Temporary road circuit |
| Course Mi: | 3.487 |
| Course Km: | 5.612 |
| Distance Laps: | 56 |
| Distance Mi: | 195.27 |
| Distance Km: | 314.26 |
| Pole Driver: | Jo Siffert |
| Pole Country: | Switzerland |
| Pole Team: | Lotus-BRM |
| Pole Time: | 1:59.0 |
| Fast Driver: | Jo Siffert |
| Fast Team: | Lotus-BRM |
| Fast Time: | 2:00.4 |
| Fast Country: | Switzerland |
| First Driver: | Jo Siffert |
| First Country: | Switzerland |
| First Team: | Lotus-BRM |
| Second Driver: | Carel Godin de Beaufort |
| Second Country: | Netherlands |
| Second Team: | Porsche |
| Third Driver: | Carlo Abate |
| Third Country: | Italy |
| Third Team: | Cooper-Maserati |
The 12th Syracuse Grand Prix was a motor race, run to Formula One rules, held on 25 April 1963 at Syracuse Circuit, Sicily. The race was run over 56 laps of the circuit, and was won easily by Swiss driver Jo Siffert in a Lotus 24.
| Pos | Driver | Entrant | Constructor | Time/Retired | Grid | |
|---|---|---|---|---|---|---|
| 1 |  Jo Siffert | Ecurie Filipinetti | Lotus-BRM | 2.06:25.4 | 1 | |
| 2 |  Carel Godin de Beaufort | Ecurie Maarsbergen | Porsche | + 1:20.6 s | 4 | |
| 3 |  Carlo Abate | Scuderia Centro Sud | Cooper-Maserati | + 1 Lap | 5 | |
| 4 | Bob Anderson | DW Racing Enterprises | Lola-Climax | + 4 Laps | 2 | |
| 5 |  Jo Bonnier | Rob Walker Racing Team | Lotus-Climax | + 7 Laps | 3 | |
| 6 | Gaetano Starrabba | Gaetano Starrabba | Lotus-Maserati | + 7 Laps | 10 | |
| Ret |  Günther Seiffert | Autosport Team Wolfgang Seidel | Lotus-BRM | Gearbox casing | 9 | |
| Ret |  Bernard Collomb | Bernard Collomb | Lotus-Climax | Front wishbone | 7 | |
| Ret | Lorenzo Bandini | Scuderia Centro Sud | Cooper-Maserati | Oil pipe | 6 | |
| Ret | André Wicky | André Wicky | Cooper-Climax | Engine | 8 | |
| WD |  Phil Hill | Ecurie Filipinetti | Lotus-BRM | Car not ready | - | |
| WD | Jim Clark | Team Lotus | Lotus-Climax | - | ||
| WD | Trevor Taylor | Team Lotus | Lotus-Climax | - | ||
| WD | John Surtees | SEFAC Ferrari | Ferrari | Car not ready | - | |
| WD |  Nasif Estéfano | Scuderia Tomaso | De Tomaso | Car not ready | - |