Combs Ditch is a linear earthwork in Dorset on Charlton Down.
[2] The earthwork consists of a bank with a ditch on the north east side.
The parishes of Charlton Marshall and Spetisbury lie to the north east of Combs Ditch while Winterborne Whitechurch, Winterborne Kingston and Anderson lie to the south west.
The bank ranges from 5.4 m to 8.5 m wide with a maximum height of 2.2 m. The ditch varies in width from 4.8 to 8.5 m.[3] Excavation found third- or fourth-century Roman pottery lying on the turf line behind the bank probably before its final reconstruction.
[4] The limited excavation seems to show an Iron Age boundary ditch being enlarged into a defensive earthwork in the late Roman or post-Roman period.