| Roles | Competed in Olympic Games | |
|---|---|---|
| Sex | Male | |
| Full name | Léonard Jules "Léon"•Mascaux | |
| Used name | Léon•Mascaux | |
| Born | 19 January 1900 in Saint-Amand-les-Eaux, Nord |  FRA |
| Died | 25 June 1965 (aged 65 years 5 months 6 days) in Nivelle, Nord | FRA |
| Measurements | 169 cm | |
| Affiliations | Olympique Lillois — Lille, Nord | FRA |
| NOC | France | FRA |
Personal Bests: 3000 – unknown; 5000 – 15:26.4e (1924).
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1924 Summer Olympics | Athletics | FRA |
Léon Mascaux | |||
| 5,000 metres, Men (Olympic) | 9 | |||||
| Team Race, Men (Olympic) | France | 4 |
