William Wallace Kellett (also W. Wallace Kellett) (December 20, 1891 – July 22, 1951) was an American aircraft executive and manufacturer, especially associated with rotary-wing aircraft. He was president of Kellett Autogiro Corporation and Republic Aviation Corporation. His company constructed the first successful wingless aircraft in the United States. There was a wide variety of potential users for his unique airplane. The first autogyro airplane used by the United States Post Office Department to carry mail was produced by Kellet. He received congressional approval for funding such a project after he gave senators and representatives demonstration flights of his wingless autogyro aircraft as part of a promotion in Washington D.C.