"I Don't Like Mondays" is a song by Irish group The Boomtown Rats about the 1979 Cleveland Elementary School shooting in San Diego. It was released in 1979 as the lead single from their third album, The Fine Art of Surfacing. The song was a number one single in the UK Singles Chart for four weeks during the summer of 1979, and ranks as the sixth biggest hit of the UK in 1979. Written by Bob Geldof and Johnnie Fingers, the piano ballad was the band's second single to reach number one on the UK chart.

The Grover Cleveland Elementary School shooting took place on January 29, 1979, at a public elementary school in San Diego, California, United States. The principal and a custodian were killed; eight children and a police officer were injured. A 16-year-old girl, Brenda Spencer, who lived in a house across the street from the school, was convicted of the shootings. Charged as an adult, she pleaded guilty to two counts of murder and assault with a deadly weapon, and was given an indefinite sentence. As of October 2019, she remains in prison.

A reporter reached Spencer by phone while she was still in the house after the shooting, and asked her why she did it. She reportedly answered: "I don't like Mondays. This livens up the day," which inspired Bob Geldof and Johnnie Fingers to write the Boomtown Rats song "I Don't Like Mondays".

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