Agnes of Montferrat (c. 1187 – 1207/1208) was the first empress consort of Henry of Flanders, Latin Emperor of Constantinople.
She was a daughter of Boniface I, Marquess of Montferrat, founder of the Kingdom of Thessalonica, and his first wife Helena del Bosco.
According to Geoffrey of Villehardouin, Agnes was residing in Lombardy until her father summoned her to Thessaloniki in 1206.
Boniface proceeded to send Otto de la Roche, megaskyr or grand seignior of Athens, as his envoy to Henry, proposing a marriage between her and the emperor.
[1] According to the Dictionnaire historique et Généalogique des grandes familles de Grèce, d'Albanie et de Constantinople (1983) by Mihail-Dimitri Sturdza, the marriage was part of a new alliance between Boniface and Henry against Kaloyan of Bulgaria.