Ide de Mauvoisin de Rosny

Ide de Mauvoisin (before 1318–1375) was the daughter of Guy Mauvoisin and Laure de Ponthieu. Around 1329 she married John III, Count of Dreux, and was widowed childless in 1331, afterwards holding the lands of Saint-Valery in dower for forty-two years.

On 2 September 1332 she married Mathieu III de Trie, Marshal of France, who died on 26 November 1344. A charter of 1344 records her dower dispute with his sisters. She died in 1375.