Johannes Franciscus Vonck, also known by the Francization Jean-François Vonck or the Netherlandization Jan-Frans Vonck, (29 November 1743 – 1 December 1792) was a lawyer and one of the leaders of the Brabant Revolution from 1789-1790. This Revolution led to the founding of the United States of Belgium in January 1790. Vonck was the leader of the radical Vonckists faction of revolutionaries which were named after him. They were inspired by the French Revolution, pleaded for the abolition of the feudal government of the state based on privileges and were in favour of a more centralised government.