Dunglass Castle was a castle at Dunglass in East Lothian, Scotland. It was a seat of the Home family and frequently visited by the Stewart kings. A fortification was built during the Rough Wooing. There are no upstanding masonry remains of the castle. A more recent mansion has also been demolished. The medieval Dunglass Collegiate Church at the site is maintained by Historic Environment Scotland.

The first medieval castle at Dunglass was built by the Pepdie family in the 14th century. On the marriage of Nicola Pepdie to Sir Thomas Home of Home, the castle and lands passed to the Home family. James IV stayed at Dunglass in December 1496, and played cards. He gave a tip, also known as "drinksilver", to masons working on the building and enjoyed a banquet which included spices brought from Edinburgh.

Alexander Home, 3rd Lord Home was allied with Margaret Tudor against John Stewart, Duke of Albany, Regent of Scotland. Albany brought his army to Dunbar and Dunglass in October 1515. The Earl of Home was persuaded to meet Albany at Dunglass and was arrested. Home was able to make an alliance with the Earl of Arran against Albany. Home was executed in 1516 and the family were forfeited, and for a time the castle passed to Archibald Douglas, 6th Earl of Angus. Dunglass was besieged and slighted by the English under the command of Henry Percy, 6th Earl of Northumberland in the winter of 1532.

In September 1547, during the war now known as the Rough Wooing, Dunglass was captured by the forces of the Duke of Somerset from George Douglas of Pittendreich, and was refortified and garrisoned by the English. According to the English journalist of the campaign, William Patten, the Scottish captain of the castle, Matthew Home, had only 21 soldiers, and surrendered without a fight. John Brende led 300 workmen, called "pioneers" to demolish the old fortifications. The walls had solid foundations in the craggy bedrock. Some of the stone was taken to Eyemouth, where Richard Lee was building an artillery fort on a new site. Richard Lee seems to have been the designer of the new English fort at Dunglass, with his assistant William Ridgeway.

In January 1549, the French landed two boat loads of ladders at Dunbar, intending to attack the English garrison, but they did not make an assault. The English soldiers were entertained by two Irish minstrels on 9 July 1549. The garrison was commanded by Sir Thomas Holcroft.

A new artillery fortification was built on new a site nearby overlooking the remains of the older castle of the Home family, set out by Richard Lee. He also enclosed the village of Dunglass with a rampart. The Earl of Shrewsbury envisaged the fortified site would be a base for the whole English army, but Protector Somerset objected to the increasing cost. During September 1549, Holcroft reported the "fort now groweth in a great strength". He described his men's "continual labour of carrying baskets, sods, and going to the wood, watching", despite sickness in the camp. The captains were Christopher Asheton, followed by Francis Aslaby. It was one of the most expensive works undertaken during the war, costing £2,300.

The French diplomat in London, Odet de Selve, heard news of the building of the fort on a hill near the sea. He obtained a plan made by a spy in December 1548, and commented that the fort itself was small, and had no battery of guns on one side which was defended only by the steep valley of the Dunglass water. According to Jean de Beaugué, the new site was hard to defend and had no water.

On 31 January 1550, soldiers from Dunglass fired two barn yards at the Place of Nether Keith and burnt houses in the village. The English raiders were chased back to Dunglass. Regent Arran gave orders for cannon to be shipped to bombard the fort on 11 April 1550. The Earl of Rutland was at Dunglass in May 1550 and took the opportunity to have his mail armour scoured in a bag of bran and had his pistol mended. He bought white fabric in the camp at Dunglass to modify his hose for the hot weather in July.