Marc, Baron Bossuyt (born 9 January 1944 in Ghent) is a member of the Permanent Court of Arbitration in The Hague and a former judge at the Belgian Constitutional Court. Bossuyt obtained a Dr.iur (LLM) at the University of Ghent in 1968, a Certificate of international relations at Johns Hopkins University in Bologna in 1969, and a PhD in political science from the Graduate Institute of International Studies in 1975. He is professor emeritus of international law at the University of Antwerp.