"Crazy" is a song written by English soul artist Seal and Guy Sigsworth. The song was produced by Trevor Horn for Seal's debut album Seal (1991). Released as his official debut single, "Crazy" became one of Seal's biggest hits, reaching the top five in the United Kingdom while becoming his first top ten single in the United States. It has since been covered by several artists, including Alanis Morissette, whose version was released as a single from her album The Collection (2005).

Seal wrote "Crazy" in 1990 inspired by the fall of the Berlin Wall and the Tiananmen Square Massacre in 1989. In 2015, Seal said of the song's conception in 1990: "I felt the cycle had reached its apex. I felt the world changing and I felt profound things happening."

According to the song's producer Trevor Horn, "Crazy" was made over the course of two months: "Crazy wasn't an easy record to make, because we were aiming high."

The song's signature is a keyboard mantra that continually swells and swirls, driven by bass-heavy beats and wah-wah pedal guitars played by Simply Red guitarist Kenji Suzuki. Its floating, ambient stylings established a sound years before "The Politics of Dancing" by Paul Van Dyk or William Orbit's work with Madonna and All Saints. Orbit produced a remix of the track for the single release. Seal's vocals are deeply melodic and soulful, at times with a characteristic rasp, while at others soaring high above the backing track.

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