**Kari Karhunen** (1915–1992) was a Finnish probabilist and a mathematical statistician. He is best known for the Karhunen–Loève theorem and Karhunen–Loève transform.

Karhunen received his doctorate in 1947 from the University of Helsinki. The topic of his thesis was (in German) *Über lineare Methoden in der Wahrscheinlichkeitsrechnung*, in English *On linear methods in probability and statistics*. The advisor of his thesis was the mathematician Rolf Nevanlinna.

Karhunen worked as a lecturer at the University of Helsinki before leaving the academic world to be employed by the insurance corporation Suomi, becoming CEO of the company in 1963.

Karhunen served in 1955 on the Finnish Committee for Mathematical Machines, which developed the first Finnish computer ESKO.