| Birth Date: | 14 December 1880 |
| Birth Place: | Årstad, Sweden |
| Death Date: | 3 October 1919 (aged 38) |
| Death Place: | Isle of Man, Great Britain |
| Height: | 183 cm |
| Weight: | 80 kg |
| Sport: | Athletics |
| Event: | Decathlon |
| Club: | IFK Halmstad |
| Pb: | 200 m – 24.2 (1904) 800 m – 2.04.8 (1905) 1500 m – 4:12.9 (1906) LJ – 6.68 m (1904) DT – 34.30 m (1900) HT – 34.50 m (1906) JT – 44.30 m (1906) |
| Show-Medals: | yes |
Hjalmar Stefanus Mellander (14 December 1880 – 3 October 1919) was a Swedish track and field athlete. He competed in the 800 m, long jump, javelin throw and ancient pentathlon at the 1906 Intercalated Games.
Mellander finished runner-up behind Peter O'Connor at the 1904 AAA Championships[1] and third in the 1905 AAA Championships.[2] [3]
At the 1906 Intercalated Games (Olympic Games), he finished fourth in the long jump and javelin throw. He won the pentathlon event, which consisted of standing long jump, Greek-style discus throw, javelin throw, 192 m sprint and Greco-Roman wrestling.
Mellander was a physiotherapist who practiced in Liverpool since 1902. In 1919 he died while trying to rescue a drowning man on the Isle of Man.