Terrington St Clement is a large village in Norfolk, in the UK. It is situated in the drained marshlands to the south of The Wash, 7 miles west of King's Lynn, Norfolk, and 5 miles east of Sutton Bridge, Lincolnshire, on the old route of the A17 trunk road. The parish covers an area of . Much of the farm land is of alluvial silt and clay which has been reclaimed from the sea amounting to approximately half of the total parish area.
The population of Terrington St Clement has grown substantially. In area it is the third largest civil parish in Norfolk.
In AD 970 Godric gifted part of the lands of Turrintonea to the monks of Ramsey Abbey. The name Terrington comes from the early Saxon “Tun” meaning enclosure or homestead of Tir(a)s people. The settlement is referred to in the Domesday Book as Tilinghetuna.
By the medieval period the small settlement which began on raised ground on the edge of the marsh had grown substantially. The magnificent Parish Church, dedicated to St Clement (i.e. Pope Clement I), known as the "Cathedral of the Marshland", was built in the 14th century by Edmund Gonville, Rector of Terrington, who founded Gonville Hall (now Gonville and Caius College) at Cambridge University.
Methodists arrived in the village in 1813 and during the Victorian era the Wesleyan Methodist Chapel  and Primitive Methodist Chapel were established along with a Salvation Army headquarters and 3 other mission chapels. A lively shopping centre had developed by the beginning of the 20th century, but most of the independent traders have now disappeared, along with all but two of the village's pubs.
There was once a Terrington railway station serving the settlement, but this is now closed.