Karl-Oskar Svensson (11 November 1925 – 15 July 2000), often nicknamed Rio-Kalle, was a Swedish football goalkeeper from Helsingborg.

He stood between the posts in 349 Allsvenskan matches, from his debut to the spring of 1959, after which he quit playing on elite level.

Karl Svensson played in four of the big tournaments, the 1950 and 1958 World Cups, as well as the 1948 and 1952 Olympic Games,[1] winning a medal in all four.

His nickname Rio-Kalle, derived from Rio de Janeiro and the common Swedish nickname for Karl, Kalle, was given to him during the 1950 World Cup in Brazil after two heroic matches against Italy and Spain, which both actually were played on Estádio do Pacaembu in São Paulo.

Kalle Svensson has been honoured with a statue placed outside Olympia in Helsingborg which was made by sculptor Risto Karvinen.