Claim: Leyton Orient F.C. is located in London.

Leyton Orient Football Club -LSB- ˌleɪtən_ˈɔəriənt -RSB- is a professional football club in Leyton , London , England . They play in the National League , the fifth tier of the English football league system , following relegation from the Football League in the 2016-17 season . They are known to their fans as the Os , and club 's home colours are all red .   Leyton Orient have spent one season in the top flight of English football , in 1962 -- 63 . In 1978 , they 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 , leaving them bottom of Division Two in 1994 -- 95 .   Leyton Orient 's home ground Brisbane Road is officially known as the Matchroom Stadium after former club chairman Barry Hearn 's sports promotion company . Hearn became chairman in 1995 after the club was put on sale for # 5 by then-chairman Tony Wood , a period covered by the television documentary Orient : Club for a Fiver , made by production company Open Media for Channel 4 . In 2014 , Hearn sold the club to Italian businessman Francesco Becchetti , who achieved two relegations in three years under 11 managers .   Leyton Orient finished seventh , one place away from the playoff positions , in both the 2010 -- 11 and 2012 -- 13 seasons . In the 2013 -- 14 season , Orient lost the League One Play-Off final at Wembley to Rotherham United and in 2015 were relegated to League Two . On 22 April 2017 , Orient were relegated to the National League , ending their 112 year stay in the Football League .