George I (George Louis; German: Georg Ludwig; 28 May 1660 – 11 June 1727) was King of Great Britain and Ireland from 1 August 1714 until his death, and ruler of the Duchy and Electorate of Brunswick-Lüneburg (Hanover) in the Holy Roman Empire from 1698.

George was born in Hanover and inherited the titles and lands of the Duchy of Brunswick-Lüneburg from his father and uncles. A succession of European wars expanded his German domains during his lifetime, and in 1708 he was ratified as prince-elector of Hanover. At the age of 54, after the death of his second cousin Queen Anne of Great Britain, George ascended the British throne as the first monarch of the House of Hanover. Although over 50 Roman Catholics were closer to Anne by primogeniture, the Act of Settlement 1701 prohibited Catholics from inheriting the British throne; George was Anne's closest living Protestant relative. In reaction, Jacobites attempted to depose George and replace him with Anne's Catholic half-brother, James Francis Edward Stuart, but their attempts failed.

During George's reign, the powers of the monarchy diminished and Britain began a transition to the modern system of cabinet government led by a prime minister. Towards the end of his reign, actual political power was held by Robert Walpole, now recognised as Britain's first de facto prime minister. George died of a stroke on a trip to his native Hanover, where he was buried.

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