Sir Ralph Euer, also known as Ralph de Eure, (c. 1350 – 12 March 1422) of Witton, Stokesley, Berwick Hill, Darreshall, Kirkley, Felton, Ayton, Malton and Boughton Spittle was an English knight and servant of the Crown and of the Bishops of Durham.

[1] Ralph was the second son of John Euer of Stokesley and Witton and Margaret de Grey.

Between 1380 and 1420 he undertook numerous commissions and enquiries on behalf of the Crown, at the same time serving as an ambassador to Scotland.

He served as Lieutenant to John of Lancaster, 1st Duke of Bedford as Constable of England by 26 May 1411.

Ralph married firstly Isabel, the daughter of Aymer Atholl of Felton and Mary Felton, and had the following known issue: He married secondly Katherine, daughter and co-heiress of William de Aton of Ayton and Malton and Isabel Percy, and had the following known issue: He married thirdly Maud Greystoke, the daughter of Ralph, Lord Greystoke; they had no known issue.