"Fever" is a song written by Eddie Cooley and Otis Blackwell, who used the pseudonym John Davenport. It was originally recorded by American R&B singer Little Willie John for his debut album, Fever (1956), and released as a single in April of the same year. The song topped the Billboard R&B Best Sellers in the US and peaked at number 24 on the Billboard pop chart. It was received positively by music critics and included on several lists of the best songs during the time it was released.