Knut Fægri (July 17, 1909 – December 10, 2001) was a Norwegian botanist and palaeoecologist born in Bergen. He was the son of Major Ole A. Fægri (1875–1962) og Gudrun Stoltz (1881–1940) and married 1941 Museum manager Nancy Meyer (1912–2007), and was nephew of botanist, natural scientist and politician Jørgen Brunchorst (1862-1917).
Fægri got his Examen artium at the Bergen katedralskole in 1926 and took the dr.philos. degree in 1934 with the thesis Über die Längenvariationen einiger Gletscher des Jostedalsbre und die dadurch bedingten Pflanzensukzessionen. He was hired as a research fellow at the Chr. Michelsen Institute, was appointed professor at Bergen Museum in 1946 and from 1948 jointly at the museum and the University of Bergen. He retired in 1979. He was also editor-in-chief of the periodical Naturen between 1947 and 1977.
Fægri was much-engaged in debates over societal issues of broad public interest. He was outspoken in his criticism of the negative effetcts of hydroelectric power development on nature and biodiversity. He often had controversial views. For example, in the 1960s he agitated for a liberal act on use of marihuana, which he saw as something the state should leave with the individual citizen to decide about. Privately, he was a proponent of naturism and he appeared naked in a debate of that topic broadcast on Swedish television.
His son Knut Fægri jr. became professor in chemistry.
This is a list of Fægri's most notable works:
- Über die Längenvariationen einiger Gletscher des Jostedalsbre und die dadurch bedingten Pflanzensukzessionen (1934)
- Quartärgeologische Untersuchungen im westlichen Norwegen I-II (1935–40)
- Studies on the Pleistocene of Western Norway III-IV (1943–49)
- Text-Book of Modern Pollen Analysis (4 editions 1950-1989, with Johannes Iversen)
- Norges planter I (1958)
- Norges planter II 1960)
- The Distribution of Norwegian Vascular Plants: Coast Plants (1960)
- The Principles of Pollination Ecology (1966, with L. van der Pijl)
- Krydder (1966)
- Dikteren og hans blomster (1988)
- Fægri, Knut (1934). "Über die Längenvariationen einiger Gletscher des Jostedalsbre und die dadurch bedingten Pflanzensukzessionen". Bergens Museums Årbok 1933 (7): 1–255.
- "Fægri, Knut". Aschehoug og Gyldendals Store norske leksikon. Kunnskapsforlaget. 2007.
- "Tilbakeblikk: Naturbarnet Fægri". Hubro 2/2009
- XVI International Botanical Congress 1-7 August 1999, Saint Louis: SUMMARY REPORT
- "Author Query for 'Faegri'". International Plant Names Index.
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