Early career In January 2006, he left Billericay to become manager of semi-professional club
Fisher Athletic. Fisher finished third in the
Isthmian League Premier Division in season 2005–06 and beat
Hampton & Richmond 3–0 in the play-off final to win promotion to
Conference South. Edinburgh left Fisher by mutual consent in November 2006. He subsequently joined
Grays Athletic as assistant manager to
Andy King in December 2006, and took over as manager on 5 January 2007 after King's resignation. However, Edinburgh's first match in charge ended in disappointment as his team lost 3–1 to Southport. His reign as manager of Grays Athletic came to an end on 20 February 2008, when his contract was terminated by mutual consent, leaving the club 14th in the
Conference Premier. On 9 April 2008 it was announced that Edinburgh would become Colin Lippiatt's assistant at
Woking following the departure of
Frank Gray and Gerry Murphy.
Rushden & Diamonds In October 2008, Edinburgh became assistant manager to
Garry Hill at
Conference Premier club
Rushden & Diamonds. On 10 February 2009 he was appointed as caretaker manager following Hill's resignation and on 24 April 2009, Edinburgh was appointed manager on a permanent basis. He guided the team to a fourth-placed finish in the 2009–10 season securing a play-off spot within the Conference Premier but they were unable to reach the Conference Play-off Final at Wembley after lacklustre performances in both games of the two legged tie against Oxford United. The games finished 1–1 and 2–0 to Oxford. The 2010–11 season saw Rushden & Diamonds secure a mid-table finish in 13th place but they never seriously challenged for promotion. In the summer of 2011, the club was expelled from the Football Conference and subsequently went into
administration, bringing Edinburgh's time at the club to an end.
Newport County On 4 October 2011, Edinburgh was appointed manager of
Newport County, taking over from
Anthony Hudson with the team in 23rd place in the Conference Premier.
Jimmy Dack was appointed as his assistant manager on 6 October 2011. Newport County finished the
2011–12 season in 19th position hence avoiding relegation and reached the
FA Trophy final at
Wembley Stadium on 12 May 2012 which Newport lost 2–0 to
York City. In August 2012, Edinburgh was selected as Conference Manager of the Month after Newport County won all five of their opening matches of the
2012–13 season. He led Newport to a 3rd-place finish that season, reaching the Conference Premier play-offs. Newport County won the
2013 Conference Premier play-off final versus Wrexham at Wembley stadium 2–0 to return to the Football League after a 25-year absence with promotion to
League Two. In January 2014 Edinburgh stated he had rebuffed an unofficial approach directly to himself to be considered as manager of
Northampton Town. In his first season as a
Football League manager Edinburgh led Newport County to a 14th-place finish in League Two for the
2013–14 season. Edinburgh led the Gills to a 12th-place finish in the third tier of English football, after a poor start to the season led to the sacking of former manager
Peter Taylor on 31 December. Gillingham had won just three of their first 15 league games, and were sitting 20th in League One, just two points above relegation. The 2015–16 was his first full season in charge, Edinburgh led the Gills to a second-place position at Christmas, after a 3–0 victory against
Millwall. Gillingham had also managed to defeat League favourites
Sheffield United, with a 4–0 victory on the first day of the season. However, after a run of bad injuries to crucial players, Gillingham slipped to a ninth-place finish in League One, after losing on the last day of the season, against Millwall. Edinburgh was sacked on 3 January 2017, along with his entire coaching team, with the club placed 17th in League One.
Northampton Town On 13 January 2017, Edinburgh was appointed manager of League One club
Northampton Town on a two-and-a-half-year contract, formally taking over on 16 January. Edinburgh was dismissed on 31 August 2017, following a poor run of results including losing the first four matches of the season.
Leyton Orient at Brisbane Road On 29 November 2017, Edinburgh was appointed manager of
Leyton Orient of the
National League on a two-and-a-half-year contract. Edinburgh guided Orient to the top of the National League winning the division and promotion back to the Football League in the 2018–19 campaign. On 24 January 2020, Leyton Orient announced that the West Stand at
Breyer Group Stadium would be renamed the Justin Edinburgh Stand, which was officially commemorated the next day during the club's home match against Newport County. ==Personal life and death==