The Trésorier d'Aire (Treasurer of Aire) was a 13th-century trouvère, sometimes identified with the Trésorier de Lille.
According to Jean-François Nieus and Aurélie Stuckens, the poet is Guillaume d'Haverskerque, a son of Bauduin, lord of Haverskerque, and the treasurer of the churches of both Aire and Lille. He married a daughter of the famous crusader Elinard, , but later entered the church. He is recorded as treasurer of the collegiate church of between February 1252 and March 1257. He was the treasurer of the collegiate church of Saint-Pierre de Lille in 1270–1271 and then provost of Aire beginning in 1273 or 1274. He died between 1282 and 1285.
Only part of one song, a , is attributed to the Trésorier d'Aire. In the song "Biau sire Tresorier d'Aire" (or "Biaus sire..."), found in chansonniers a and b, Jehan Bretel and Lambert Ferri team up to debate Jehan le Cuvelier and the Trésorier d'Aire.
He is the addressee in two envois of Thomas Herier.
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