Guillaume Ducatel (born 21 January 1979 in Bully-les-Mines, Pas-de-Calais) is a French former footballer who played as a midfielder.
He spent the majority of his playing career with Boulogne, appearing for the club in all of the top four divisions of the French football league system and playing more than 300 league games in total in a 13-year spell.
In November 2014, Ducatel was appointed manager of sixth-tier club Le Touquet.