Ketil Melsted Johnsen Motzfeldt (10 August 1814 – 17 November 1889) was a Norwegian naval officer and government official.
His parents were government minister Peter Motzfeldt (1777-1854) and Ernesta Birgitte Margrethe Stenersen (1789-1848).
He was the brother of Ulrik Anton Motzfeldt and brother-in-law of Christian Birch-Reichenwald.
From 1870 to 1885, he was elected as a member of Parliament from Jarlsberg og Laurvigs Amt (now Vestfold).
This article about a Norwegian politician born in the 1810s is a stub.