| Louis Mottiat | |
| Fullname: | Louis Mottiat |
| Nickname: | The iron man (:De man van ijzer) |
| Birth Date: | 1889 7, df=yes |
| Birth Place: | Bouffioulx, Belgium |
| Death Place: | Gilly, Belgium |
| Discipline: | Road |
| Role: | Rider |
| Proyears1: | 1912-1913 |
| Proteam1: | Thomann |
| Proyears2: | 1913-1914 |
| Proteam2: | Alcyon |
| Proyears3: | 1919-1921 |
| Proteam3: | Alcyon-La Sportive |
| Proyears4: | 1922-1926 |
| Proteam4: | Alcyon-Dunlop |
| Majorwins: | 8 stages Tour de France Liège–Bastogne–Liège(2x) Tour of Belgium (2x) |
Louis Mottiat (6 July 1889 – 5 June 1972) was a Belgian professional road bicycle racer. Mottiat was born in Bouffioulx, and because of his endurance was nicknamed 'the iron man'. His career was interrupted by World War I. He died in Gilly, aged 82.