Guillaume Hoarau (born 5 March 1984) is a Reunionese footballer who plays for Young Boys in the Swiss Super League and formerly for the France national football team as a striker.
Hoarau started his football career at JS Saint-Pierroise in his native Réunion. In 1995, Le Havre AC scouts considered him too "thin" and signed his then-teammate Florent Sinama Pongolle. After gaining the attention of then-Le Havre manager Jean-François Domergue, Hoarau signed his first professional contract at the age of 20 for Le Havre in January 2004. He made his league debut on 12 May 2004 against Châteauroux in a 1–2 loss, coming on as a substitute.
Despite being signed, Hoarau spent the majority of his career under Domergue playing in the reserves, often earning brief call-ups to the senior squad, then quickly being sent down. He registered his first career goal in just the second match of the 2004–05 season in a 2–1 victory over Amiens. Despite this, his play was heavily limited following the firing of Domergue and the appointment of temporary manager Philippe Hinschberger. During the following season under new manager Thierry Uvenard, his playing time increased—he appeared in 28 matches, scoring five goals. The next season, he only made five appearances for Le Havre before being sent on loan to Gueugnon, where he made 21 appearances and scored eight goals.