"I Kissed a Girl" is a song recorded by American singer Katy Perry for her second studio album, One of the Boys (2008). It was released on April 28, 2008, by Capitol Records as the lead single from the record. Perry co-wrote the song with its producers Dr. Luke and Benny Blanco, with additional songwriting provided by Max Martin and Cathy Dennis. "I Kissed a Girl" is a pop rock song with elements of new wave. Perry stated its lyrics are "about the magical beauty of a woman". The song sparked controversy for its homosexual themes.

The song topped the Billboard Hot 100 chart for seven consecutive weeks, becoming the 1,000th number-one song of the rock era. The single has sold over 4.7 million digital copies in the US alone. "I Kissed a Girl" is one of eight songs by Perry to sell over 4 million digital copies in the US, the others being "Hot n Cold", "California Gurls", "Firework", "E.T.", "Teenage Dream", "Roar" and "Dark Horse". It has reached the summit of the charts in nearly twenty countries, including Australia, Canada, Ireland, and the United Kingdom, while peaking within the top five in other European countries such as Belgium, Finland, and France. The song is one of the best-selling singles worldwide.

The accompanying music video for the song was released on May 16, 2008. The video, directed by Kinga Burza, features Perry in a setting inspired by burlesque and Moulin Rouge styles. It features appearances from Perry's friends, including actress Shannon Woodward and then-unknown American electropop singer Kesha. The song is recognized as the 10th best-selling single in the 21st century. "I Kissed a Girl" was performed and a nominee at the 51st Grammy Awards (Grammy Award for Best Female Pop Vocal Performance). It was also nominated for Favorite Song at the 2009 Kids' Choice Awards. The song was also included in Perry's performance in Super Bowl XLIX's Pepsi Halftime Show in 2015.

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