Phil Mitchell is a fictional character from the BBC soap opera EastEnders, played by Steve McFadden. He was introduced to the soap opera on 20 February 1990 and was followed by his brother Grant, sister Sam and mother Peggy. Phil was one of the major characters introduced by executive producer Michael Ferguson, who wanted to bring in some macho male leads. Phil and his brother Grant became popularly known as the Mitchell brothers in the British media, with Phil initially portrayed as the more level-headed of the two thugs. Storylines featuring the Mitchell family dominated the soap opera throughout the 1990s, with Phil serving as one of the show's central characters and protagonists since the 1990s. McFadden temporarily left the series in late 2003, then returned in April 2005 for a brief appearance before making a permanent return in October 2005, and has now overtaken Dot Cotton as the second-longest-serving character in EastEnders, surpassed only by original character Ian Beale. A teenage version of Phil, played by Daniel Delaney, appeared in a flashback episode broadcast on 5 September 2022, which focuses on the Mitchell family in the 1970s.

EastEnders is a British television soap opera created by Julia Smith and Tony Holland which has been broadcast on BBC One since February 1985. Set in the fictional borough of Walford in the East End of London, the programme follows the stories of local residents and their families as they go about their daily lives. Within eight months of the show's original launch, it had reached the number one spot in BARB's television ratings, and has consistently remained among the top-rated series in Britain. Four EastEnders episodes are listed in the all-time top 10 most-watched programmes in the UK, including the number one spot, when over 30 million watched the 1986 Christmas Day episode. EastEnders has been important in the history of British television drama, tackling many subjects that are considered to be controversial or taboo in British culture, and portraying a social life previously unseen on UK mainstream television.