William Cunningham, 9th Earl of Glencairn (Scottish Gaelic: Uilleam Coineagan) (1610–1664), was a Scottish nobleman, Lord Chancellor of Scotland, and a cavalier. He was also the chief of Clan Cunningham.
The eldest son of William Cunningham, 8th Earl of Glencairn, on 21 July 1637 this William obtained a ratification from King Charles I of England, under the Royal Sign Manual, of the original Glencairn letters patent of 1488.
He was sworn a member of the Privy Council of Scotland and in 1641 was appointed a Commissioner of the Treasury.
Finlaystone House and estate in Inverclyde was the seat of the Earl of Glencairn and chief of clan Cunningham from 1405 to 1796.
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