thumb|right|Sketch by [[Jan Matejko, 1867.]]
Jan Szczęsny Herburt (12 January 1567 – 31 December 1616) was a Polish political writer, diplomat and a member of the Polish Sejm parliament. An early supporter of Chancellor Jan Zamoyski, he took part in many diplomatic missions, most notably to Sweden, the United Kingdom, the Vatican and the Ottoman Empire. He supported the election of King Sigismund III of Poland to the throne, but then became his adversary and joined the leaders of the infamous Zebrzydowski Rebellion in 1607. As a rebel, he was imprisoned by royalists from 1607 to 1609. Herburt was the author of many rebellion-related and anti-magnate treaties. He was also a founder of the Kudryntsi Castle.
Life
Jan Szczęsny Herburt hailed from a Polonized German-Ruthenian family. His mother Kateryna Drohojowska was Ruthenian. His father Jan Herburt was a historian and lawyer of Moravian origin, whose ancestors had allegedly moved to Ruthenia at the invitation of Leo I of Galicia during the early 14th century.
Herburt received education in Western Europe, and later served as a diplomat in service of his relative, crown chancellor Jan Zamoyski and took part in the suppression of Nalyvaiko Uprising.