William "Casey Bill" Weldon (possibly December 10, 1909 – September 28, 1972) was an American country blues musician.
Some details of Weldon's life are unconfirmed. According to some sources, he was born in Pine Bluff, Arkansas, United States, and later lived and worked in Chicago, Illinois. He reportedly made his way to Chicago via Kansas City, which gave rise to his nickname, a version of K.C. He was one of the early musicians who recorded playing slide guitar. He played upbeat, hokum and country blues tunes. Playing a National steel guitar flat on his lap Hawaiian style, he was known as the "Hawaiian Guitar Wizard".
