Grimston is a hamlet and civil parish in the Ryedale district of North Yorkshire, England. It lies beside the main B1363 road between York and Helmsley. Grimston lies in the Howardian Hills just south of the North Yorkshire Moors National Park and close to Ampleforth Abbey and College.
Grimston is small, and is made up up around 14 households . Historically, it originates from an old manorial estate , and several of the buildings still hold related names: Grimston Manor, Grimston Manor Farm, Grimston Lodge, Grimston Cottage and Grimston Grange.
Prior to the nationwide municipal reorganization of 1974, Grimston was part of Helmsley Rural District. Historically, it was located in the ecclesiastical parish of [[Place:Gilling East, North Riding of Yorkshire, England|Gilling East in the Rydale Wapentake.