George III (1738–1820) was King of Great Britain and Ireland from 1760 to 1820.
George III or 3 may also refer to:
People George III of Georgia (died 1184) George III, Landgrave of Leuchtenberg (1502–1555) George III, Prince of Anhalt-Dessau (1507–1553) George III Dadiani, Prince of Mingrelia (died 1582) George III, Count of Erbach-Breuberg (1548–1605) George III of Imereti (1605–1639) George III of Brieg (1611–1664) George III, Landgrave of Hesse-Itter (1632–1676) George III Gurieli, Prince of Guria (died 1684) George III of Cyprus (Archbishop of Cyprus) (born 1949)
Other uses George III (ship), a British convict ship wrecked in 1835 GEORGE 3, a computer operating system from ICL
See also King George (disambiguation)