Guillaume Gillet (born 9 March 1984) is a Belgian professional football coach and former player.

[4] In December 2015, while at Anderlecht, Gillet said he had turned down an offer from LA Galaxy but that he could still move to Major League Soccer that winter.

[6] On 7 August 2017, Gillet signed a two-year contract with Olympiacos, thereby re-uniting with his former manager at Anderlecht, Besnik Hasi.

[9] On 2 August 2018, Gillet signed a two-year contract with French Ligue 2 club RC Lens.

[13] Gillet made his international debut for Belgium in 2007,[1] and has appeared in FIFA World Cup qualifying matches for his country,[14] scoring the equalising goal in the 45th minute in a 1–1 draw with Croatia.