Donald Jeffry Herbert (July 10, 1917 – June 12, 2007), better known as Mr. Wizard, was an American television personality. He hosted two television shows about science aimed at children.

Born in Waconia, Minnesota, Herbert was a general science and English major at the University of Wisconsin–La Crosse (then called La Crosse State Normal College) who was interested in drama. His career as an actor was interrupted by World War II when he enlisted in the United States Army as a Private. Herbert later joined the United States Army Air Forces took pilot training and became a B-24 bomber pilot who flew 56 combat missions from Italy with the 767th Bomb Squadron, 461st Bomb Group of the Fifteenth Air Force. When Herbert was discharged in 1945 he was a Captain and had earned the Distinguished Flying Cross and the Air Medal with three oak leaf clusters.

After the war Herbert worked at a radio station in Chicago where he acted in children's programs such as the documentary health series It's Your Life (1949). It was during this time that Herbert formulated the idea of Mr. Wizard and a general science experiments show that used the new medium of television. Herbert's idea was accepted by Chicago NBC station WNBQ and the series Watch Mr. Wizard premiered on March 3, 1951. The weekly half hour show, co-produced by Jules Power, featured Herbert as Mr. Wizard, with a young boy and girl who watched while Herbert performed interesting science experiments. The experiments, many of which seemed impossible at first glance, were usually simple enough to be re-created by viewers. Each show ended the same way: with an experiment that somehow displayed the letters "FCMBB", which Mr. Wizard reminded us stood for "Fruit, Cereal, Milk, Bread and Butter, the five elements of a healthy breakfast."