Knut Ytre-Arne (19 December 1896 – 30 March 1968) was a Norwegian politician for the Liberal Party.
He was born in Haus.
He was elected to the Norwegian Parliament from Hordaland in 1950, and was re-elected on three occasions. He had previously served as a deputy representative in the period 1945–1949, but toward the end of this term, representative Nils Tveit died and was replaced by Ytre-Arne as a regular representative.
Ytre-Arne was deputy mayor of Fana municipality in the periods 1945–1947, 1947–1951 and 1951–1955.