A major Benedictine monastery in Yorkshire whose medieval possessions included land and rights in Acaster Selby. Its estates were surrendered to the Crown at the Dissolution in 1539.

The holder is an institution rather than an individual. The evidence securely links Selby Abbey to Acaster property, but the precise boundary between abbey demesne, dependent land, and the manor as catalogued by the MDR is not fully demonstrated.

Research sources:
- Borthwick Institute for Archives, University of York, Selby Abbey parish records catalogue, item 355: royal confirmation to Selby Abbey concerning five acres of wood in Acaster, Westminster, 25 January 1315; corroborated by the historical description of Acaster Selby in the Comprehensive Gazetteer of England and Wales. — https://www.york.ac.uk/media/borthwick/documents/catalogues/pr/s-parishes/Selby%20Abbey%20updated.pdf