Leyton Orient Football Club Brisbane Road, London Essex England

Leyton Orient F.C. (pronounced /ˈleɪtən ˈɔəriənt/) are an English professional football club based in east London. They currently play in League One of the Football League. The team is often known to its fans simply as the Os.

Leyton Orient have spent only one season in the top flight of English football, in 1962–63. Though they were immediately relegated, they had three memorable victories within the space of twelve days against local rivals West Ham, eventual champions Everton, and Manchester United. In August 1974, they were Manchester United's first opposition in the latter's only post-war Second Division campaign. In 1978, Orient reached the semi-finals of the FA Cup for the only time in their history, under the management of Jimmy Bloomfield. Between October 1993 and September 1995, Orient did not win a single away game in the league. This terrible run of form saw them finish bottom of Division Two in 1994–95.

Leyton Orient's home stadium, Brisbane Road, is situated in Leyton, in the London Borough of Waltham Forest. It is officially known as the Matchroom Stadium, named after club chairman Barry Hearn's own sports promotion company. Hearn became chairman in 1995 after the club was famously put on sale for five pounds by the then-chairman, Tony Wood OBE, after his coffee-growing business in Rwanda was destroyed by that country's civil war. The period of the club's near-closure was covered by the television documentary Orient: Club for a Fiver(made by Open Media for Channel 4).

Geraint Williams was appointed manager on 5 February 2009, taking over from Kevin Nugent who was in temporary charge after the sacking of Martin Ling on 18 January 2009.Williams left the club on 3 April 2010 after the 3-1 home defeat to Hartlepool United. Nugent resumed temporary charge for one game, after which Russell Slade was appointed manager until the end of the season.