| Roles | Competed in Olympic Games | 
|---|---|
| Sex | Male | 
| Full name | Karl Gunnar Alfred•Karlsson-Tjörnebo | 
| Used name | Gunnar•Karlsson-Tjörnebo | 
| Nick/petnames | Sösdala | 
| Born | 23 March 1927 in Tjörnarp, Höör, Skåne (SWE) | 
| Died | 15 March 2009 in Helsingborg, Skåne (SWE) | 
| Measurements | 176 cm / 68 kg | 
| Affiliations | IFK Växjö, Växjö (SWE) / IFK Helsingborg, Helsingborg (SWE) | 
| NOC |   Sweden | 
Personal Best: 3000S – 8:41.2 (1961).
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1952 Summer Olympics | Athletics |  SWE | 
Gunnar Karlsson | |||
| 3,000 metres Steeplechase, Men (Olympic) | 12 | |||||
| 1956 Summer Olympics | Athletics |  SWE | 
Gunnar Tjörnebo | |||
| 3,000 metres Steeplechase, Men (Olympic) | 6 h2 r1/2 | |||||
| 1960 Summer Olympics | Athletics |  SWE | 
Gunnar Tjörnebo | |||
| 3,000 metres Steeplechase, Men (Olympic) | 5 |