Graffham is a village and civil parish in West Sussex, England, situated on the northern escarpment of the South Downs. The civil parish is made up of the village of Graffham, part of the hamlet of Selham, and South Ambersham. It forms part of the Bury Ward for the purposes of electing a Councillor to Chichester District Council.
In the 1861 census the parish covered 6.71 km² (1,658 acres) and had a population of 410. Selham was still a separate parish covering 4.22 km² (1,042 acres) with a population of 123.
In the 2001 census the parish covered 11.81 km² (2,917 acres) and had 229 households with a total population of 510 of whom 229 residents were economically active. The population at the 2011 Census was 516.
The village of Graffham contains two pubs The Forester's Arms and The White Horse, a recreation ground, the Anglican parish church of St Giles, which was largely rebuilt between 1874 and 1887, and a primary school. Seaford College, an independent school, is close by.
Notable residents include David Young, Baron Young of Graffham , James Burnett and Timothy Bell, Baron Bell.
Selham contains The Three Moles, one of the smallest pubs in Sussex along with the church of St James which is largely 11th century, never having undergone any major rebuilding.
The parish also contains the remains of Lodsworth Castle, a large 13th-century motte near Selham at Lodsbridge beside the River Rother.