Dean Cullen Smith (September 27, 1899 – March 4, 1987) was a pioneer American mail pilot, test pilot, flying instructor, Antarctic pilot, and airline pilot. At 17 years of age, he became the youngest flight instructor in U.S. Army history. He was a lead pilot for the U.S. Postal Service's airmail service, and was the first pilot to initiate night air mail flights. He was an executive for many airlines and aircraft companies.