Haughley Green is a village in Suffolk, England, four miles from Stowmarket. It was the location of the Haughley Experiment, the first scientific study comparing organic farming and modern chemical-based farming.
Hillcroft Preparatory School was in Haughley Green. Established in 1911, it was the oldest co-ed preparatory (elementary/pre-teen) day school in Suffolk. It used to occupy Walnutree Manor, former headquarters of the Soil Association. In 2006 the school closed down and no longer exists.