| Roles | Competed in Olympic Games • Competed in Intercalated Games | 
|---|---|
| Sex | Male | 
| Full name | Carl August Hjalmar•Johansson | 
| Used name | Hjalmar•Johansson | 
| Nick/petnames | Julle | 
| Born | 20 January 1874 in Karlskrona, Blekinge (SWE) | 
| Died | 30 September 1957 in Segeltorp, Huddinge, Stockholm (SWE) | 
| Measurements | 170 cm / 76 kg | 
| Affiliations | IK Atle, Stockholm (SWE) / Stockholms KK, Stockholm (SWE) / Amateur Swimming Club, London (GBR) | 
| NOC |   Sweden | 
| Medals | OG | 
| Gold | 1 | 
| Silver | 1 | 
| Bronze | 0 | 
| Total | 2 | 
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1906 Intercalated Games | Athletics |  SWE | 
Hjalmar Johansson | |||
| Standing Long Jump, Men (Intercalated) | 19 | |||||
| Diving (Aquatics) |  SWE | 
Hjalmar Johansson | ||||
| Platform, Men (Intercalated) | 6 | |||||
| Swimming (Aquatics) |  SWE | 
Hjalmar Johansson | ||||
| 100 metres Freestyle, Men (Intercalated) | 8 | |||||
| 1908 Summer Olympics | Diving (Aquatics) |  SWE | 
Hjalmar Johansson | |||
| Platform, Men (Olympic) | 1 | Gold | ||||
| Swimming (Aquatics) |  SWE | 
Hjalmar Johansson | ||||
| 200 metres Breaststroke, Men (Olympic) | 2 h3 r1/3 | |||||
| 1912 Summer Olympics | Diving (Aquatics) |  SWE | 
Hjalmar Johansson | |||
| Platform, Men (Olympic) | 4 | |||||
| Plain High, Men (Olympic) | 2 | Silver |