Sean Slater is a fictional character from the BBC soap opera EastEnders, played by Robert Kazinsky, who made his first appearance on 22 August 2006. Sean's existence was revealed on 9 December 2005 when his sister Stacey Slater returns to Walford after their mother, Jean, attempts suicide. It was announced on 18 January 2008 that Kazinsky would be leaving the show, and he made his final appearance on 1 January 2009. He returned for a brief stint on 26 April 2019, and departed again on 6 May 2019. Kazinsky returned again for one-off appearances on 1 November 2021 and 7 April 2022.

Robert John Appleby, known professionally as Robert Kazinsky, is an English actor. He is known for his roles as Casper Rose in the Sky One drama Dream Team (2005–2006) and Sean Slater in the BBC soap opera EastEnders. In 2013, he portrayed Chuck Hansen in Pacific Rim and Macklyn Warlow in the sixth season of HBO's True Blood. In 2016, he played Orgrim Doomhammer in Warcraft and Jimmy Pritchard in the Fox television series Second Chance. In 2019, he appeared as the Don in Captain Marvel.