Seamer is a village and civil parish in the Scarborough district of North Yorkshire, England. It was the location of the Mesolithic Age settlement of Star Carr. The parish is composed of the townships of Seamer and Irton and the chapelry of East Ayton. Its area is 8,450 acres, of which 18 acres are covered by water, 4,422 acres are arable, 2,178 acres permanent grass and 738 woodland. The subsoil is Alluvium, Oxford Clay, Corallian Beds and Inferior Oolite.