"Poison" is a song by American recording artist Beyoncé. It is included on the 2009 deluxe edition of her third studio album, I Am… Sasha Fierce (2008) and the EP titled I Am...Sasha Fierce – The Bonus Tracks (2009). It was written by Johntá Austin, Mikkel S. Eriksen and Tor Erik Hermansen of the production team Stargate and Beyoncé while the production was handled by the later two. The song leaked online in August 2009 prior to the release of the deluxe edition of I Am… Sasha Fierce. During that month, it was included on a mixtape by DJ Haze titled Big R&B Ego.

"Poison" is a slow-tempo song in which the female protagonist talks about a bad relationship that she cannot abandon. It received mostly positive reviews from critics who noted that although the song was cut out of the track-listing of the standard edition of the album, it was a solid track. Following the release of the EP I Am... Sasha Fierce – The Bonus Tracks in Korea, the song peaked at number one on the South Korea Gaon International Chart during the week ending February 7, 2010.

"Poison" was written by Johntá Austin, Mikkel S. Eriksen and Tor Erik Hermansen of the production team Stargate and Beyoncé for her third studio album I Am… Sasha Fierce (2008). It was produced by Stargate and Beyoncé while the audio mixing was done by Carlos Otanedel and Damien Lewis at Soapbox Studios in Atlanta. The instrumentation of the song was provided by Stargate at the Roc the Mic studio in New York and the recording was done by Mikkel S. Eriksen. Jim Caruana also worked on the recording of the song.

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