Frank Floyd, known as Harmonica Frank (October 11, 1908 – August 7, 1984)  was an American blues singer, guitarist and harmonicist.

Frank Floyd was born in Toccopola, Mississippi, the son of itinerant parents who separated without giving him a name, though he is recorded in the 1910 census as Shankles Floyd. He was raised by his sharecropping grandparents, who died while he was a teenager. He taught himself to play harmonica when he was 10 years old, and he eventually learned guitar. He gave himself the name Frank Floyd, and began performing in the 1920s for traveling carnivals and medicine shows.