Carl Hjalmar August Johansson was a Swedish pioneer diver and swimmer who competed at the 1908 and 1912 Summer Olympics.

The men's 10 metre platform, also known as the high diving competition, was one of two diving events on the diving at the 1908 Summer Olympics programme, along with the men's 3 metre springboard. The competition was held from Monday 20 to Friday 24 July 1908. Twenty-four divers from six nations competed. Each nation could enter up to 12 divers.