Marcus Melchior (1897–1969) was a Danish rabbi. The rabbi of the main synagogue in Copenhagen, Denmark, at the time of the rescue of the Danish Jews in October 1943, during the Second World War. After escaping with his family and most other Danish Jews to Sweden, he served as the acting rabbi for the Jewish refugees in Sweden until the end of the war, in mid 1945. In 1947 he became the chief rabbi of Denmark, a post he held until his death, in 1969.