Brighton & Hove Albion F.C.–Crystal Palace F.C. rivalry

The Brighton–Crystal Palace rivalry, also nicknamed the A23 derby and the M23 derby, is the derby between English football teams Brighton & Hove Albion and Crystal Palace. The nicknames come from the A23 road and the M23 motorway between Sussex and south London. While the A23 does connect Brighton to Croydon, where Crystal Palace's stadium is based, the M23 does not directly connect to either location, running between the M25 and Crawley.

The rivalry did not seriously arise until the late 1970s, when both teams, under the guidance of ambitious young managers, rose from the Third Division to the First Division. Roy Hodgson, current manager of Palace, has stated that he does not recall such any such rivalry with Brighton as a Palace fan in the 1950s–60s.

The two teams are unusually distant for an English football rivalry, but Brighton is the only professional football club in Sussex. Until Crawley Town were promoted to the Football League in 2011, Crystal Palace were the nearest other professional club to Brighton, Selhurst Park lying 37 miles from Falmer Stadium.

Brighton currently boast the superior head-to-head record in the derby, with 40 total wins against Crystal Palace to their 38. Palace have won five cup games and Brighton three, while Brighton have won 37 league games and Palace 33.