The siege of Port Royal, also known as the Conquest of Acadia, was a military siege conducted by British regular and provincial forces under the command of Francis Nicholson against a French Acadian garrison and the Wabanaki Confederacy under the command of Daniel d'Auger de Subercase, at the Acadian capital, Port Royal. The successful British siege marked the beginning of permanent British control over the peninsular portion of Acadia, which they renamed Nova Scotia, and it was the first time the British took and held a French colonial possession. After the French surrender, the British occupied the fort in the capital with all the pomp and ceremony of having captured one of the great fortresses of Europe, and renamed it Annapolis Royal.

Lieutenant-General Francis Nicholson was a British Army general and colonial official who served as the governor of South Carolina from 1721 to 1725. He previously was the Governor of Nova Scotia from 1712 to 1715, the Governor of Virginia from 1698 to 1705, the Governor of Maryland from 1694 to 1698, the Lieutenant Governor of Virginia from 1690 to 1692, and the Lieutenant Governor of the Dominion of New England from 1688 to 1689.