| Guido Leoni | |
| Nationality: | Italian |
| Gp Active Years: | 1949, 1951 |
| Gp Teams: | Mondial |
| Gp Race Starts: | 3 |
| Gp Race Wins: | 1 |
| Gp Podiums: | 1 |
| Gp Total Points: | 8 |
| Gp Poles: | N/A |
| Gp Fastest Laps: | N/A |
| Gp Last Win: | 1951 125cc Spanish Grand Prix |
| Gp Last Race: | 1951 125cc Spanish Grand Prix |
Guido Leoni (July 14, 1915 - May 6, 1951) was an Italian Grand Prix motorcycle road racer. He won the 1951 125cc Spanish Grand Prix riding for the Mondial factory racing team.[1] One month later, while competing in a race in Ferrara, Leoni was involved in a multiple-bike accident and was killed.[2] He was posthumously awarded fifth place in the 1951 125cc world championship.