Hungarian Americans (Hungarian: amerikai magyarok, pronounced [ˈɒmɛrikɒji ˈmɒɟɒrok]) are Americans of Hungarian descent. The U.S. Census Bureau has estimated that there are approximately 1.396 million Americans of Hungarian descent as of 2018. The total number of people with ethnic Hungarian background is estimated to be around 4 million. The largest concentration is in the Greater Cleveland Metropolitan Area in Northeast Ohio. At one time, the presence of Hungarians within Cleveland proper was so great that the city was known as the "American Debrecen," with one of the highest concentrations of Hungarians in the world.

In 1583, Hungarian poet Stephanus Parmenius joined Humphrey Gilbert's expedition to North America with the intention of writing a chronicle of the voyage and its discoveries. Parmenius reached Newfoundland, likely becoming the first Hungarian in the New World.

Hungarians have long settled in the New World, such as Michael de Kovats, the founder of United States Cavalry, active in the American Revolution. Hungarians have maintained a constant state of emigration to the United States since then; however, they are best known for three principal waves of emigration.

Agoston Haraszthy, who settled in Wisconsin in 1840, was the first Hungarian to settle permanently in the United States and the second Hungarian to write a book about the United States in his native language. After he moved to California in the Gold Rush of 1849, Haraszthy founded the Buena Vista Vineyards in Sonoma (now Buena Vista Carneros) and imported more than 100,000 European vine cuttings for the use of California winemakers. He is widely remembered today as the "Father of California Viticulture" or the "Father of Modern Winemaking in California."

The first large wave of emigration from Hungary to the United States occurred in 1849–1850, when the so-called "Forty-Eighters" fled from retribution by Austrian authorities after the defeat of the Hungarian Revolution of 1848. Lajos Kossuth gave a seven-month speaking tour of the U.S. in 1851 and 1852 to great acclaim as a champion of liberty, thereby unleashing a brief outburst of pro-Hungarian emotions. He left embittered because his refusal to oppose slavery alienated his natural constituency, and his long-term impact was minimal. By 1860, 2,710 Hungarians lived in the U.S., and at least 99 of them fought in the Civil War. Their motivations were not so much antislavery as a belief in democracy, a taste for adventure, validation of their military credentials, and solidarity with their American neighbors.

An increase of immigration from Hungary was also observed after World War II and The Holocaust, a significant percentage of whom were Jewish.

Andrew Grove (1936–2016), one of the three founders of Intel Corporation summarized his first twenty years of life in Hungary in his memoirs:

By the time I was twenty, I had lived through a Hungarian Fascist dictatorship, German military occupation, the Nazis' "Final Solution," the siege of Budapest by the Soviet Red Army, a period of chaotic democracy in the years immediately after the war, a variety of repressive Communist regimes, and a popular uprising that was put down at gunpoint... [where] many young people were killed; countless others were interned. Some two hundred thousand Hungarians escaped to the West. I was one of them.