Robert James Sinclair (born 29 August 1989) is an English footballer who plays as a midfielder for National League South club Hemel Hempstead Town.
Sinclair started his career in the youth system at Luton Town, signing a professional contract in July 2007.
He was loaned out to Conference Premier club Salisbury City in January 2008, until the end of the 2007–08 season.
On returning to his parent club in May 2008, Sinclair was released, and joined Salisbury on a permanent basis later that month.
Injury disrupted his time at the club, playing 54 games during his two-and-a-half-year spell.
He left Salisbury when the club were relegated two divisions after a breach of rules on unpaid debts, and he joined Stevenage of League Two on a free transfer in June 2010.
Stevenage earned promotion to League One in his first season with the club.
Following a brief loan spell at Aldershot Town in March 2012, Sinclair left Stevenage in June 2012, only to rejoin the club three months later.
He was loaned out once again to Aldershot in November 2012.
He left Stevenage by mutual consent in January 2013, and signed for Salisbury City, his second spell at the club.
Sinclair was a part of the team that gained promotion to the Conference Premier during the 2012–13 season.
He left Salisbury in June 2014, signing for Forest Green Rovers.
He helped Forest Green earn promotion to the Football League during the 2016–17 season.
In the summer of 2017, Sinclair elected to play semi-professionally for Oxford City and then in November 2018 joined another semi-professional team in the form of National League South club Hemel Hempstead Town.