Vald'Yerre (; before 2023: Commune nouvelle d'Arrou , literally New Commune of Arrou) is a commune in the department of Eure-et-Loir, north-central France. The municipality was established on 1 January 2017 by merger of the former communes of Arrou (the seat), Boisgasson, Châtillon-en-Dunois, Courtalain, Langey and Saint-Pellerin.
Population data refer to the commune in its geography as of January 2025.