"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.