| Hjalmar Lönnroth | |
| Fullname: | Hjalmar Lönnroth |
| Nationality: | Swedish |
| Birth Date: | 1856 9, df=yes |
| Birth Place: | Kungälv, Sweden |
| Death Place: | Gothenburg, Sweden |
| Classes: | 8 Metre |
| Updated: | 2014-02-03 |
Arvid Martin Hjalmar Lönnroth (11 September 1856 in Kungälv, Bohuslän – 24 July 1935 in Gothenburg) was a sailor from Sweden, who represented his native country at the 1908 Summer Olympics in Ryde, Isle of Wight, Great Britain in the 8 Metre.[1]