Newcastle United Football Club is a professional association football club based in Newcastle upon Tyne, Tyne and Wear, England. The club competes in the Premier League, the top tier of English football. Since the formation of the club in 1881, when Newcastle East End absorbed the assets of Newcastle West End to become Newcastle United, the club has played its home matches at St James' Park. Located in the centre of Newcastle, it currently has a capacity of 52,305.

The club has been a member of the Premier League for all but three years of the competition's history, spending 93 seasons in the top flight as of May 2025, and has never dropped below English football's second tier since joining the Football League in 1893. Newcastle United have won four League titles, six FA Cups, one League Cup and an FA Charity Shield, as well as the Inter-Cities Fairs Cup, the ninth-highest total of trophies won by an English club. The club's most successful period was between 1904 and 1910, when they won an FA Cup and three of their League titles. More recently the club have been League or FA Cup runners-up on four occasions in the 1990s. Newcastle were relegated in 2009, and again in 2016. The club won promotion at the first time of asking each time, returning to the Premier League, as Championship winners, in 2010 and 2017. In October 2021, a consortium led by the Public Investment Fund, the sovereign wealth fund of Saudi Arabia, became majority owners of Newcastle United. In 2025, the club won the 2024–25 EFL Cup, the club's first trophy in nearly 56 years, and their first domestic trophy since 1955.

Newcastle's traditional kit colours are black-and-white striped shirts, black shorts and black or white socks. Their crest has elements of the city coat of arms, which features two grey hippocamps. Before each home game, the team enters the field to \"Going Home\", with \"Blaydon Races\" also being sung during games.