Kristian Johan Fossheim (born 4 December 1935) is a Norwegian physicist.
He was born in Jølster. He took the dr.philos. degree in 1972, was an associate professor at the Norwegian Institute of Technology from 1970 to 1980, and professor from 1980.[1] He is also vice-praeses of the Royal Norwegian Society of Sciences and Letters,[2] and a member of the Norwegian Academy of Science and Letters.[3]