John Hay, 1st Marquess of Tweeddale (13 August 1625 – 11 August 1697) was a Scottish peer and politician who served as Lord Chancellor of Scotland.
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Early life
Hay was born in 1626. He was the eldest son of John Hay, 1st Earl of Tweeddale (created 1 December 1646) and Lady Jean Seton. After his mother's death a few days after his birth in 1625, his father remarried to Lady Margaret Montgomerie, the eldest daughter of Alexander Montgomerie, 6th Earl of Eglinton and Lady Anne Livingston (eldest daughter of Alexander Livingston, 1st Earl of Linlithgow). After his father's death in 1653, his stepmother remarried to William Cunningham, 9th Earl of Glencairn. From his father's second marriage, he had a younger half-brother, the Hon. William Hay of Drummelzier (1649–1726), who married the Hon. Elizabeth Seton, only surviving daughter of Alexander Seton, 1st Viscount of Kingston.
His father was the eldest son and heir of James Hay, 7th Lord Hay of Yester and Lady Margaret Kerr (third daughter of Mark Kerr, 1st Earl of Lothian). His mother was the only daughter of Alexander Seton, 1st Earl of Dunfermline by his second wife, Lady Grizel Leslie (the half-sister of John Leslie, 6th Earl of Rothes).