"Toxic" is a song recorded by American singer Britney Spears for her fourth studio album In the Zone (2003). It was written and produced by Christian Karlsson and Pontus Winnberg (known collectively as Bloodshy & Avant), with additional writing from Cathy Dennis and Henrik Jonback. The song released on January 13, 2004, by Jive Records, as the second single from In the Zone. After trying to choose between "(I Got That) Boom Boom" and "Outrageous" to be the second single from In the Zone, Spears selected "Toxic" instead. A dance song with elements of bhangra music, "Toxic" features varied instrumentation, such as drums, synthesizers and surf guitar. It is accompanied by high-pitched Bollywood strings and breathy vocals. Its lyrics draw an extended metaphor of a lover as a dangerous yet addictive drug. The song has received acclaim from music critics, deeming it the strongest track of In the Zone, and praised its hook and chorus. "Toxic" won Spears her first and only Grammy Award at the 2005 ceremony in the category of Best Dance Recording.

"Toxic" attained worldwide success, reaching the top-five in 15 countries, while topping the charts in Australia, Canada, Hungary, Ireland, Norway and the United Kingdom. In the United States, it became her fourth top-ten single. The accompanying music video for the song was directed by Joseph Kahn and features references to Blade Runner, The Seven Year Itch and the films of John Woo. It portrays Spears as a secret agent in the search of a vial of green liquid. After she steals it, she enters an apartment and poisons her unfaithful boyfriend. The video also includes interspersed scenes of Spears naked with diamonds on her body. After Janet Jackson's Super Bowl incident, the video was considered too racy for MTV and was moved to late-night programming.

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