Winterton is a civil parish and Winterton-on-Sea is the main village within it in the English county of Norfolk. As its name suggests, it is situated on the North Sea coast and is some 13 km (8.1 mi) north of the town of Great Yarmouth and 30 km (19 mi) east of the city of Norwich.
The civil parish has an area of 5.7 km2 (2.2 sq mi) and in the 2001 UK census had a population of 1,359 in 589 households. Winterton-on-Sea borders the parishes of Hemsby, Horsey and Somerton. For the purposes of local government, the parish falls within the District of Great Yarmouth.
Between 1851 and 1861 a number of Winterton families migrated south to Caister. Many of those families joined the Caister Beachmen. This organization is claimed to be the basis of the modern Lifeboat service.
The parish officially changed its name from Winterton to Winterton-on-Sea in 1953.