"Days of the Week" is a song by Stone Temple Pilots, released as a single from their album Shangri-La Dee Da in 2001. The song also appears on the compilation albums Thank You and Buy This. Despite being a moderate rock radio hit, the song did not endure STP's Set list, it was partially performed on November 13, 2001, the last time the song was played in full was on November 3, 2001.
The song's lyrics were written by vocalist Scott Weiland, and deal with how his heroin addiction has affected the relationship with wife Mary Forsberg. The song's music was written by guitarist Dean DeLeo and has a much poppier sound than most of the band's previous singles.
The music video depicts two STPs: one dressed up in white shirts and ties going door-to-door like salesmen or possibly missionaries, and the other taking a journey through space. The video has various shots of the band playing.