Stacey Branning (also Slater) is a fictional character from the BBC soap opera EastEnders, played by Lacey Turner. She made her first appearance on 1 November 2004. The character was introduced as a feisty and troublesome teenager, an extension of the already established Slater clan. She has featured in numerous high-profile storylines, including abortion, drug abuse, a troubled relationship with her mother Jean (Gillian Wright), discovering she has bipolar disorder, an affair with her father-in-law Max (Jake Wood) and murdering her rapist Archie Mitchell (Larry Lamb). The love triangle between Stacey, Janine Butcher (Charlie Brooks) and Ryan Malloy (Neil McDermott), the father of her daughter Lily Branning and the discovery that she murdered Archie and her being framed for attempted murder by Janine, forced her to flee the country on 25 December 2010.

Stacey returned for a short stint between 7 February and 25 March 2014 when she turned herself in to the police for Archie's murder. She later appealed, and returned permanently on 5 August. Since then, Stacey's storylines include her friendship with Shabnam Masood (Rakhee Thakrar), a relationship with Martin Fowler (James Bye), a fling with Shabnam's fiancé Kush Kazemi (Davood Ghadami), possessing a mystery key, being electrocuted, giving birth to a son, Arthur, and developing a rare mental illness known as postpartum psychosis. Stacey has proven popular with fans and critics, and Turner has won multiple awards for her portrayal.