Casey Bill Weldon (1909–c.1960s) was a U.S. blues musician who lived and worked in Chicago, best known for his slide-guitar skill. He played upbeat tunes, usually in a band. He is also known as a member of the Memphis Jug Band.

Weldon was born on 10th July 1909. In 1927 he made a recording for Victor with Charles Polk and other members of what would become (with personnel changes) the Memphis Jug Band. In October of that year they moved to Atlanta and recorded several sides, including "Kansas City Blues". In 1930, the last year of the band's contract with Victor, the band recorded twenty sides. The contract ended after a final recording session in November 1930 in Memphis just before the financial crash of the 1930s bankrupted Victor. On Memphis Minnie's last recording for Bluebird Records in October 1935, Weldon accompanied her for the first time. He played on two sides, "When the Sun Goes Down, Part 2" and "Hustlin' Woman Blues", but dropped out of the following two songs.

In October 1927, when the Victor field recording unit visited Atlanta, Georgia, he recorded two sides, including a chilling, haunting song called "Turpentine Blues", which would have left him immortalised if he had never recorded again. He did not enter another recording studio until eight years later, when he laid down many recordings for Vocalion Records. After his divorce from Memphis Minnie, he disappeared from the public eye and stopped recording by 1938.

His date of death is unknown, though assumed to be some time in the 1960s.

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