Willem Vrelant was a Dutch book illuminator.
He is first registered in 1449, when an illuminator from Vreeland named Willem Backer obtained citizenship of Utrecht. He may have lied in Utrecht for years, as in 1450 he finished there the Hours of William de Montfort. From 1454 to 1481 he is recorded as a member of the Bruges guild of bookmakers. His large and productive workshop produced a book of hours which is now in Baltimore, the Hours of Isabella of Castille, the Chronicles of Hainaut and individual miniatures in the Hours of Mary of Burgundy.