| 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 in Göteborg (Gothenburg), Västra Götaland (SWE) |
| Affiliations | KSSS, Saltsjöbaden, Nacka (SWE) |
| NOC | Sweden |
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1908 Summer Olympics | Sailing | SWE |
Hjalmar Lönnroth | |||
| 8 metres, Open (Olympic) | Saga | 5 |