| Roles | Competed in Olympic Games | |
|---|---|---|
| Sex | Male | |
| Full name | Arvid Martin Hjalmar•Lönnroth | |
| Used name | Hjalmar•Lönnroth | |
| Born | 11 September 1856 in Romelanda, Kungälv, Västra Götaland |  SWE |
| Died | 15 July 1917 (aged 60 years 10 months 4 days) in Göteborg (Gothenburg), Västra Götaland | SWE |
| Affiliations | KSSS — Saltsjöbaden, Nacka, Stockholm | SWE |
| NOC | Sweden | SWE |
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1908 Summer Olympics | Sailing | SWE |
Hjalmar Lönnroth | |||
| 8 metres, Open (Olympic) | Saga | 5 |
