Glenn Curtis Flear (born 12 February 1959) is an English chess grandmaster. He is the author of several books, some on chess openings and some on the endgame.
He was awarded the International Master title in 1983 and Grandmaster title in 1987.
Flear created one of the greatest-ever chess tournament upsets when, as a last minute substitute, he won the London 1986 event (ahead of Chandler, Short, Nunn, Ribli, Polugaevsky, Portisch, Spassky, Vaganian, Speelman, and Larsen, amongst others). To round off the occasion, he married five-time French Women's Champion Christine Leroy during the event. They have two sons, James and Nathan.
He also represented England at the 1986 Dubai Olympiad (earning a team silver medal) and at the European Team Chess Championship at Plovdiv in 2003.
He lives in Montpellier, France.