"Crazy in Love" is the lead single from American singer Beyoncé Knowles's 2003 debut solo album, Dangerously in Love. It features a guest verse from rapper Jay Z. The artists wrote and composed the song in collaboration with Rich Harrison and Eugene Record; the former also produced it with Beyoncé. Using samples from The Chi-Lites' 1970 song "Are You My Woman (Tell Me So)", "Crazy in Love" is an R&B and pop love song that incorporates elements of hip hop, soul, and 1970s-style funk music. Its lyrics describe a romantic obsession that causes the protagonist to act out of character.

Columbia Records released "Crazy in Love" on May 18, 2003, as the lead single from Dangerously in Love. It was a number-one hit in the United States and United Kingdom, and achieved top-ten peaks on several other countries's record charts. With global sales of 2.9 million. Music critics praised "Crazy in Love's" hook, Jay Z's contribution, and Beyoncé's assertive delivery of the lyrics. VH1 declared it the greatest song of the 2000s decade, while Rolling Stone ranked it as the 118th best song of all time in 2010. At the 46th Grammy Awards, "Crazy in Love" won Best R&B Song and Best Rap/Sung Collaboration.

The song's accompanying music video features Beyoncé in various dance sequences. It won three awards at the 2003 MTV Video Music Awards, and its director, Jake Nava, won the Music Video Production Association award for Best R&B Video in 2004. Since 2003, "Crazy in Love" has been a staple in Beyoncé’s live performances and concert tours. The American Society of Composers, Authors and Publishers (ASCAP) recognized "Crazy in Love" as one of the most performed songs of 2004. Artists including David Byrne have covered the song, and it has been used in various television shows and other media.

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