Angreau (; ) is a village of Wallonia and district of the municipality of Honnelles, located in the province of Hainaut, Belgium.
The earliest mention of this locality is Angrellum (Latin: little Angre). In the first Middle Ages, Angreau was part of the stronghold of Angre, of which it was probably an outbuilding with a fortified tower. Angreau has been a commune since the year 1250.