ACASTER-SELBY, a township, in the parish of Stillingfleet, E. division of Ainsty wapentake, W. riding of York, 7¼ miles (S. by W.) from York; containing 188 inhabitants. This place, which anciently belonged to the abbot of Selby, is pleasantly situated on the banks of the navigable river Ouse. A college for a provost and two or three fellows, one of whom was to instruct children, was founded here by Robert Stillington; the revenue, at the Dissolution, was £33. 10. 4.