Thomas de la Hay

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Sir Thomas de la Hay, 7th Lord of Erroll (c. 1342 – July 1406) was Lord High Constable of Scotland.

He was the third member of the Hay family to hold this post. He was the son of David de la Hay and a daughter of John Keith of Innerpeffer.

He was one of the Commissioners appointed to treat with the English for the ransom of David II. 1353, and was a hostage for his ransom 1354; acted as Constable of Scotland at the coronation of Robert II. at Scone, March 26. 1371, and next day took the oaths of homage to his Majesty, and swore to the Act of Settlement of the Crown, April 4. 1371; served heir to his grandfather, Sir John Keith of Innerpeffer, January 19- 1389-90; had a grant of Slaines, which Robert I. had given to the deceased Gilbert de Haya, 1376; and had all his lands erected into a free barony, June 30. 1378.