Leiston is a town in eastern Suffolk, England. It is situated near Saxmundham and Aldeburgh, about 2 miles (3.2 km) from the North Sea coast and is 21 miles (34 km) northeast of Ipswich and 90 miles (140 km) northeast from London. The town had a population of 6,240 at the 2001 Census, reducing to 5,508 at the 2011 Census.