Gamston is a village and civil parish four miles south of Retford in the English county of Nottinghamshire. The village lies on the A638 road between Retford and the Markham Moor junction with the A1 and the A57 roads. The population of the civil parish as at the 2011 Census was 246, which increased to 253 in 2021. The River Idle lies to the west of the village.