Mill Green Museum is a working 18th century watermill in Hatfield, Hertfordshire, England.[1] It is managed by Welwyn Hatfield Borough Council and admission is free.
Its heart is a working watermill, with 18th and 19th century wooden machinery restored to full working order. It is in regular use to grind organic wheat for a local bakery and for retail sale. Visitors can explore the mill, see it working and chat to the miller on duty. Flour is sold in various sizes.
The mill also houses the local museum in the old miller's house. It houses galleries such as the miller's kitchen display and a 1930s dining room in the style of the first houses to be built in the nearby Welwyn Garden City.