"Warning" is a song by American rock band Green Day. It is the second single and title track from their sixth album of the same name. The song was a number-three modern-rock hit in the United States. The song also peaked at No. 27 on the UK Singles Chart, and No. 1 on the UK Rock & Metal Singles Chart.
The main guitar riff of "Warning" has been compared to the Kinks' song "Picture Book".
The music video for "Warning" premiered on MTV in January 2001. It was directed by Francis Lawrence and shows the life of a rather oblivious young man who does dangerous, socially unacceptable and trivial things during his day. His punch-in card reveals his name to be John Earle.
Despite being included in the band's greatest hits albums International Superhits! and ', as well as appearing as a playable track in the video game ', the band did not perform the song live for 21 years since 2001, until it was performed during a warm-up show before their performance at the 2022 Lollapalooza.
US 7-inch single
UK CD1
UK CD2
UK 7-inch single
Australian CD single
Japanese CD single