Vielart, Vielars, Wilars or Wilart de Corbie was one of the earliest trouvères from northern France.
In one instance a chansonnier names him Willame (Guillaume de Corbie, William from Corbie) and some scholars have followed this, concluding that "Vielart" and its variations form a sobriquet meaning "violist" (player of a vielle) or perhaps "old man" (from French vieillard).
He was active in the Île-de-France in the first decades of the thirteenth century at the latest, since his song De chanter me semont Amours was used as the basis for a contrafactum, Quant ces floretes florir voi, by Gautier de Coincy (died 1236).
Only two songs can be firmly ascribed to him, and both survive with musical notation: De chanter and Cil qui me prient de chanter, which served as the basis for a Latin contrafactum, Dic, homo, cur abuteris.
Two other songs are ascribed to Vielart in some sources, but they are more probably the work of Gace Brulé: Desconfortés, plain d’ire et de pesance and Moins ai joie que je ne seuil.