Sonuk Mikko (? - ca 1864), commonly known as Billy Bowlegs and also known as So-Nuk-Mek-Ko, was a Seminole who gained recognition as a captain in the American Civil War. Mikko adopted the name of Chief Billy Bowlegs from (Holato Micco), who had fought in the Second and Third Seminole wars, following Holato Micco's death in 1859.