Kenneth Perry Landon (27 March 1903 Meadville, Pennsylvania – 26 August 1993 Arlington, Virginia) was a government and academic specialist on Thailand. He and his wife, Margaret Landon, were Presbyterian missionaries in southern Thailand from 1927 to 1937. At the start of America's participation in World War Two, he was called to Washington to become a State Department specialist on Thailand. After the war, he became an academic promoter of the study of Thailand.
He was the husband of Margaret Landon, who was best known for writing Anna and the King of Siam.