Johann Wittenborg (1321 – August/September 1363) was a merchant and mayor of the free port of Lübeck in what is now north Germany. He was admiral of the Hanseatic fleet at the Battle of Helsingborg and was tried and beheaded after losing this battle. Brought before the Hanseatic Council in January 1363, he was condemned to death for the Øresund defeat and "other reasons". He was beheaded in Lübeck market place in August or September 1363 and buried with the Dominicans of the Lübeck Castle Monastery.