"Seven Day Fool" is an R&B song written by American songwriter Billy Davis, and first recorded by American singer Etta James for Argo Records (a subsidiary of Chess Records) in 1961. The track was released both on a 45 RPM single (Argo #5402), paired with "It's Too Soon to Know", and on her album The Second Time Around (Argo #4011). Although not a big hit upon release, only reaching 95 in the United States, it has since become very well known on the Northern Soul and Mod scenes in the United Kingdom.

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A second recording of "Seven Day Fool" was made in 2007 by Canadian singer-songwriter Jully Black, produced by Black Eyed Peas' drummer & songwriter Keith Harris. It was released in August 2007 as the lead single from Black's second album, Revival. It peaked at number 9 on the Canadian Hot 100, becoming her first top 10 single.