Karl Korneliussen Kleppe (30 March 1877 – 27 March 1959) was a Norwegian farmer and politician for the Liberal Party. He was born at Kleppe in Klepp as a son of farmer Cornelius Carlsen Kleppe (1846–1941) and Anne Malene Tønnesdotter Anda (1855–1941). He was first educated at the Rogaland Agricultural School, graduating in 1898, and then at the Norwegian College of Agriculture in 1900. From 1900 to 1942 he was a teacher at Jæren Folk High School, and from 1909 to 1940 he was also in charge of the family farm.