Jean-Georges-Othon-Martin-Victorin-Zacharie Willmar (5 September 1763 - 1 January 1831) was a jurist, and governor of Luxembourg from 1817 to 1830. Born in Prüm, Willmar was a lawyer in the Conseil souverain. When Luxembourg was occupied by French Revolutionary troops, Willmar was appointed the "Agent national" of the commission which transitionally administered the country. When Luxembourg was incorporated into the Département des Forêts, he was appointed president of the criminal tribunal. In April 1800 he was nominated under-prefect of Bitburg. On 1 January 1831 he died in Luxembourg city.