Guillaume Thierry (born 15 September 1986) is a track and field athlete from the Republic of Mauritius.

He first represented his country at pole vault in which he competed at the 2003 World Youth Championships in Athletics held in Sherbrooke, Canada.

[1] He now competes in the decathlon and holds the Mauritian national record set on 11–12 September 2013 in Nice, France at the VII Francophone Games.

He went to college at St Andrews School[4] and then attended the University of Mauritius[5] where he completed a Degree in Management in August 2008 and a Master in Human Resource Studies in November 2010.

[11] He was potted by decathlon coach Aleksandr Nevskiy and changed to this event after finishing his Higher School Certificate.