Billy Clifford Gilmour (born 11 June 2001) is a Scottish footballer who plays as a midfielder for Premier League club Chelsea, where he is a member of the under-23 squad. He was previously with Rangers, where he developed through the club's academy and trained with the first team squad at the age of 15. He joined Chelsea in 2017 after turning down a professional contract with Rangers. He has represented Scotland at under-16, under-17 and under-21 levels.