Mellis is a small village in Suffolk, England. It has the largest area of unfenced common land in England. Oliver Cromwell exercised his troops in Mellis. It once had a railway station on the main line between London and Norwich, and a small branch line that ran to nearby Eye. Mellis Common is a 59 hectare nature reserve. In summer rare plants such as green-winged orchid, sulphur clover and adder's tongue fern flourish.