Sizewell is a small fishing village in the English county of Suffolk, England. It is located on the North Sea coast just north of the larger holiday village of Thorpeness and between the coastal towns of Aldeburgh and Southwold. It is east of the town of Leiston and is located within the Suffolk Coast and Heaths AONB. It is the site of two nuclear power stations with plans for the third station to be built at the site.
The village was part of the Ogilvie estate, which extended as far south as Aldeburgh. Sizewell Hall, now used as a Christian conference centre, is still owned by the Ogilvie family. From the end of the war up to 1955 it housed a mixed, semi-progressive prep school attended, among others, by the theatre critic and biographer Sheridan Morley.
Sizewell is part of the parish of Leiston and retains a few basic services associated with tourism, including a refreshment kiosk and a public house. A handful of fishing boats still operate from the beach.