Haughley Green is a village in Suffolk, England, located four miles from Stowmarket. It was the location of the Haughley Experiment, first scientific study comparing organic farming and modern chemical-based farming.

Hillcroft Preparatory School is located in Haughley Green. Established in 1911, it is the oldest co-ed preparatory (elementary/pre-teen) day school in Suffolk. It currently occupies Walnutree Manor, former headquarters of the Soil Association.