Lennoxlove House is a historic house set in woodlands half a mile south of Haddington in East Lothian, Scotland. The house comprises a 15th-century tower, originally known as Lethington Castle, and has been extended several times, principally in the 17th, 19th and 20th centuries. The house is protected as a category A listed building, and is described by Historic Scotland as "one of Scotland's most ancient and notable houses." The wooded estate is included on the Inventory of Gardens and Designed Landscapes in Scotland, the national listing of significant gardens.

It is now the seat of the Duke of Hamilton and Brandon.

The lands of Lethington were acquired by Robert Maitland of Thirlestane in 1345. The Maitland family constructed the earliest part of the building, the L-plan tower house at the south-west of the building. Mary of Guise stayed at Lethington in 1548 when she came to see Haddington with Piero Strozzi. The following year it was burned by the English troops who were then occupying Haddington. Prominent members of the Maitland family included the poet Richard Maitland (1496–1586), his son William Maitland of Lethington (1525–1573), Secretary of State to Mary, Queen of Scots, and his son James Maitland of Lethington (b.1568). It was then acquired by his uncle, John Maitland, 1st Lord Maitland of Thirlestane (1537–1595), it was said in an underhanded manner. Sir John Scot of Scotstarvet, writing in the seventeenth century, commented thus: "Yet the conquest he made of the barony of Liddington [Lethington] from his brother's son, James Maitland, was not thought lawful nor conscientious." James Maitland had become a Catholic and was obliged to leave Scotland. James VI of Scotland visited John Maitland, who was Chancellor of Scotland, at Lethington on 28 April 1593 to persuade him to return to court.

In 1674, Lennoxlove is said to have been the first Scottish estate to practice "enclosure", dividing the ground into evenly sized rectangular fields.

The coach house was built around 1676, to designs by Sir William Bruce. Lethington remained in the Maitland family until after the death of John Maitland, 1st Duke of Lauderdale (1616–1682) who was born there. Rooms were furnished for his second wife, Elizabeth Maitland, Duchess of Lauderdale. In 1674, her silk lined bedchamber included Indian satin curtains, an Indian screen, and an Indian cabinet. A closet room had a couch with Indian taffeta curtains.

The property was purchased by the trustees of Frances Teresa Stuart, Duchess of Richmond and Lennox following her death in 1702 for the benefit of her "neare and deare kinsman the said Walter Stuart". Walter Stuart was the eldest son of Alexander, 5th Lord Blantyre, the first cousin, twice removed, of the duchess, and was to become the 6th Lord Blantyre on the death of his father in 1704. The Duchess had stipulated that the property be called "Lennox's Love to Blantyre", this was subsequently shortened to Lennoxlove. It remained in the ownership of the Blantyre-Stewarts for almost two centuries. When the 12th Lord Blantyre died in 1900 without male heirs, the property passed into the ownership of his daughter, Ellen Stewart, and her husband Sir David Baird, 3rd Baronet of Newbyth, Prestonkirk. Their younger son, Major William Baird, commissioned the architect Sir Robert Lorimer to oversee extensive refurbishment of the house in 1912.

Lennoxlove is now the seat of the Dukes of Hamilton, having been purchased by the 14th Duke in 1946. It is open to the public during the summer, accommodates corporate events and weddings, and can be rented privately by groups.

This festival was started in November 2009, and it is being continued in November 2010.^{[citation needed]}