George III (George William Frederick; June 4, 1738January 29, 1820) was King of Great Britain and Ireland from October 25, 1760 until the union of the two countries on January 1, 1801, after which he was King of the United Kingdom of Great Britain and Ireland until his death. He was concurrently Duke and prince-elector of Brunswick-Lüneburg ("Hanover") in the Holy Roman Empire until his promotion to King of Hanover on October 12, 1814. He was the third British monarch of the House of Hanover, but unlike his two predecessors he was born in Britain, spoke English as his first language, and never visited Hanover.

Although he was not an actor, an animated version of George III appeared in the Schoolhouse Rock! songs "No More Kings" and "Fireworks".