Walter Espec (died 1153) was a prominent military and judicial figure of the reign of Henry I of England.
His father was probably William Speche, a follower of William I of England In the years up to 1120 he controlled northern England, alongside Eustace Fitz John. He was the builder of Helmsley Castle; he built also Wark Castle. As an old man, when High Sheriff of Yorkshire, he fought against the Scots at the Battle of the Standard in 1138. He was the founder of Kirkham Priory (Augustinians) and later Rievaulx Abbey (Cistercians). Kirkham Priory was founded around 1130. He then donated 1,000 acres (4.0 km2) to Rievaulx, where building started in 1132, and is largely credited for the arrival of the Cistercians in England. By 1135 he also founded Warden Abbey (Wardon) in Bedfordshire, a daughter house of Rievaulx.
- Concise Dictionary of National Biography
- Paul Dalton, « Espec, Walter (d. 1147x58) », Oxford Dictionary of National Biography, Oxford University Press, 2004.
- Janet E. Burton, The monastic order in Yorkshire, 1069–1215, Cambridge studies in medieval life and thought, Cambridge University Press, 1999, 352 pages. ISBN 0-521-55229-X.
- A.Gransden, Historical Writing in England c. 550–c.1307, 1974.
- Christopher Tyerman, « Walter Espec », dans Who's Who in Early Medieval England, 1066–1272, Shepheard-Walwyn (editor), 1996, p. 113–114. (ISBN 0-85683-132-8).
- Paul Dalton, Conquest, Anarchy and Lordship: Yorkshire, 1066–1154 (2002), p. 105.
- Wark Castle
- Frank Barlow, The Feudal Kingdom of England 1042–1216, (4th edition), p. 211.
- Houses of Austin canons - Priory of Kirkham | British History Online
- Rievaulx- A Virtual Tour
- Bedfordshire County Council: Warden Abbey