John Adam Barclay (born 25 September 1986) is a Scottish former rugby union player, who played as a flanker and Number 8.

Barclay was born in Hong Kong, where he went to Bradbury School [zh], discovering mini rugby at Stanley Fort RFC.

[3] After Williams' departure Barclay was not picked for the Scotland squad again until the 2007 World Cup after a run of strong performances for club side Glasgow Warriors.

He started the 2013–14 season with the Scarlets and was part of the Scotland squad for the 2013 Autumn Internationals, winning a cap against South Africa at Murrayfield on 17 November 2013, when he came on as a substitute on 64 minutes.

However he was picked in the wider 2015 World Cup training squad and earned his first cap since 2013 in the second warm-up match against Italy in August 2015.

On 17 November 2017 it was announced that he had signed a two-year contract with Edinburgh Rugby from the start of the 2018–19 season,[8] however a ruptured Achilles tendon delayed his debut until March 2019.

Barclay had played fourteen matches for Edinburgh- this low number of appearances being due to a combination of injuries and international duties.