| Roles | Competed in Olympic Games | |
|---|---|---|
| Sex | Male | |
| Full name | Sigfred Thomas•Madsen | |
| Used name | Sigfred•Madsen | |
| Born | 26 November 1915 in København (Copenhagen), Hovedstaden |  DEN |
| Died | 14 July 1966 (aged 50 years 7 months 18 days) in København (Copenhagen), Hovedstaden | DEN |
| Affiliations | AK Rolf — København (Copenhagen), Hovedstaden | DEN |
| NOC | Denmark | DEN |
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1936 Summer Olympics | Boxing | DEN |
Sigfred Madsen | |||
| Featherweight, Men (Olympic) | =9 |
