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- Michael John Keen (1935–1991), Atlantic Canada, marine geoscientist
- Clarence King (1893–1971), USA, first director of the U.S. Geological Survey
- James Kitching (1922–2003), South Africa, Karoo vertebrate palaeontologist
- Sir Albert Ernest Kitson (1868–1937), Australian (born England) economic geologist, mineral exploration in Africa
- Maria Klenova (1898–1976) Russian marine geologist
- Andrew H. Knoll (born 1951), USA, Harvard geologist and paleontologist
- Alan S. Kornacki (born 1952), USA, Harvard meteoriticist and geochemist for Royal Dutch Shell
- Danie G. Krige (born 1919), South African mining engineer, inventor of kriging
- M. S. Krishnan (1898–1970), Indian geologist, author of Geology of India and Burma
- Thomas Edvard Krogh (1936–2008), Canada, geochronologist, revolutionized uranium-lead radiometric dating
- William C. Krumbein (1902–1979), USA, sedimentologist
- Nikolai Kudryavtsev (1893–1971), Russian petroleum geologist
Read more about this topic: List Of Geologists