Diss is a market town in Norfolk, England. It is located on the River Waveney, near the Suffolk border. The town has a population of around 8, 000 people and is known for its weekly market, which has been running since 1254. Diss also has a number of historic buildings, including the Mere, a large lake that was once part of a Norman castle. The town is also home to a number of independent shops, cafes, and restaurants.