George Baillie-Hamilton-Arden, 11th Earl of Haddington FRSE KT DL (26 July 1827 – 11 June 1917) was a Scottish landowner and representative peer.
Lord Haddington was the son of George Baillie-Hamilton, 10th Earl of Haddington and Georgina Markham.
Lord Haddington was elected a representative peer from 1874 until his death. He was High Sheriff of Cheshire in 1871. He was created Lord Lieutenant of Haddingtonshire in 1874. He was honorary Colonel of the Lothians and Border Horse and an officer in the Royal Company of Archers.
In 1886, he was elected a Fellow of the Royal Society of Edinburgh. His proposers were Sir Thomas Grainger Stewart, Robert Grey, Sir William Turner, and Peter Guthrie Tait. He resigned from the Society in 1892.
Lord Haddington was appointed a Knight of the Order of the Thistle (KT) in the 1902 Coronation Honours list published on 26 June 1902, and was invested by King Edward VII at Buckingham Palace on 8 August 1902.
He lived at Tyninghame House near Prestonkirk in East Lothian.
On 17 October 1854, he married Helen Katharine Warrender (1834-1889), heiress and grand-daughter of Richard Arden, 1st Baron Alvanley, and had issue: