Janusz Ryszard Korwin-Mikke (Polish: [ˈjanuʂ ˈkɔrvʲin ˈmʲikkɛ]; born 27 October 1942), also known by his initials JKM or simply as Korwin, is a Polish politician and author. He was a member of the European Parliament from 2014 until 2018. He was the leader of the Congress of the New Right (KNP), which was formed in 2011 from Liberty and Lawfulness, which he led from its formation in 2009, and the Real Politics Union, which he led from 1990 to 1997 and from 1999 to 2003. He was the chairman of the party New Hope until his resignation on 15 October 2022, and from 2019 to 2023 a member of the Sejm, elected from the electoral list of Confederation Liberty and Independence. In 2024, he founded KORWiN. Korwin-Mikke is widely considered to be a paleolibertarian and far-right politician.

Janusz Korwin-Mikke was born in German-occupied Warsaw on 27 October 1942. He was the only child of Ryszard Mikke (6 February 1911 – 25 April 1966) and Maria Rosochacka (3 April 1917 – 4 August 1944). His father, Ryszard, was the head of the engineering department of the State Aviation Works [pl]. Korwin-Mikke's uncle, Tadeusz Mikke [pl], was a Lieutenant Colonel in the Polish Cavalry during the Second World War, he died on 12 September 1939 while commanding 15th Poznań Uhlan Regiment at the Battle of the Bzura, during the September Campaign.

In 1944, his mother, Maria, was killed during the Warsaw Uprising against the occupying German forces.^{[citation needed]} From then, he was under the care of his grandmother and later his stepmother. Korwin-Mikke's great-grandfather was Gustaw Izydor Mücke, son of Samuel Beniamin Mücke (who was a brewer in Kielce).

The Korwin-Mikke family, with its origins in the Kingdom of Sweden, migrated through the Electorate of Saxony to Poland, following the Great Famine of 1695–1697, alongside Augustus II the Strong, after he was elected king of the Polish-Lithuanian Commonwealth in 1697. The Germanic surname Mücke was polonized to Mikke after the family received the Korwin coat of arms. Before converting to Catholicism, Korwin-Mikke's family adhered to the Augsburg Confession, which is the primary confession of faith of the Lutheran Church and one of the most significant documents of the Protestant Reformation.

Korwin-Mikke is a distant relative of Hellmuth von Mücke, an officer of the Kaiserliche Marine, the navy of the German Empire, in the early 20th century and World War I. He is also related to Jerzy Mikke [pl], a Polish historian, publicist and writer.

Korwin-Mikke studied at the Faculty of Mathematics and Faculty of Philosophy of the Warsaw University. For his anti-communist activities, in 1964 he was detained by the communist authorities while studying psychology, law, philosophy and sociology. During the 1968 Polish political crisis, he was again arrested, jailed and expelled from the university for his participation in student protests. Despite his anti-communist activities, Korwin-Mikke was reinstated and allowed to finish his studies with the dean Klemens Szaniawski. He successfully defended his master thesis Metodologiczne aspekty poglądów Stephena Toulmina (eng. Methodological aspects of Stephen Toulmin's views), written under the guidance of Henryk Jankowski.

Korwin-Mikke met with Milton Friedman when Friedman toured Europe advocating free-market policies. Friedman wrote about Janusz Korwin-Mikke in his memoirs:

Janusz Korwin-Mikke, with whom I corresponded, had been active before liberation as an underground publisher, bringing out a translation of Capitalism and Freedom and Hayek's Road to Serfdom, as well as other libertarian literature. Subsequently, he ran for president on a strict libertarian platform. At the time we were in Warsaw, his Union of Real Policy was housed in a former dwelling that was a literal maze of small offices, all occupied by young people actively working on spreading the libertarian gospel. We had very good, lively discussions with them.