Carl Hjalmar August Johansson (20 January 1874 – 30 September 1957) was a Swedish pioneer diver and swimmer who competed at the 1908 and 1912 Summer Olympics.

[1][2] Johansson was 32 years old when he competed in three different events at the 1906 Intercalated Games, firstly he entered the 100 m freestyle swimming, where he came fourth in his heat so qualifying for the final the next day, in the final there was nine swimmers and Johansson finished eighth,[3] the same day he competed in the standing long jump event and jumped 2.690 metres to finish 19th out of 30.

[5] Two years later at the 1908 Summer Olympics he won a gold medal in the 10 m diving platform beating three other Swedish divers and an American in the final,[6] and was eliminated in the heats of 200 m breaststroke.

Johansson also rescued a fellow diver who passed out after hitting the water poorly.

[8] Johansson significantly contributed to designing the Olympic code for conduct of diving competitions.