György Klapka (Hungarian: Klapka György), also known as German: Georg Klapka, or George Klapka, (7 April 1820 – 17 May 1892) was a Hungarian soldier.
Klapka was born at Temesvár, Kingdom of Hungary (nowadays Timișoara, Romania) and entered the Austrian Army in 1838. He was still a subaltern when the Hungarian Revolution of 1848 broke out, and he offered his services to the patriot party.
He served in important staff appointments during the earlier part of the war which followed; then, early in 1849, he was ordered to replace Lázár Mészáros, who had been defeated at Kassa, and as general commanding an army corps he had a conspicuous share in the victories of Battle of Kápolna, Isaszeg, Vác, Nagysalló and . Then, as the fortunes of war turned against the Hungarians, Klapka, after serving for a short time as minister of war, took command at Komárom, from which fortress he conducted a number of successful expeditions until the Surrender at Világos (now Şiria, Romania) in the August put an end to the war in the open field. He then defended Komárom for two months, and finally surrendered on honorable terms.
Klapka left the country at once, and lived thenceforward for many years in exile, at first in England and afterwards chiefly in Switzerland. He continued by every means in his power to work for the independence of Hungary, especially at moments of European war, such as 1854, 1859 and 1866, at which an appeal to arms seemed to him to promise success. In 1859, Alexander John Cuza, the first Ruler of the United Principalities of Wallachia and Moldavia, offered general Klapka military support asking for a favourable reconfiguration of other peoples' situation in the Habsburg Empire (including Romanians): ”In May 1859 two agreements were signed between Alexandru Ioan Cuza and general Klapka, commander of the Hungarian revolutionaries, by which A.I. Cuza commits to obtain and provide weapons to Hungarian revolutionaries, helping them against Austria, at the same time setting the principles for reconciliation between the nationalities of Austria.”