Markus Ludwig Martin (25 April 1909 – 31 March 2010) was a German lawyer. He served as Attorney General of Germany from 7 April 1963 until 30 April 1974.
Born in Waltenhofen as the son of a dairy worker, Martin was able to take his Abitur thanks to a teacher, despite his father's opposition. He subsequently went on to study law and economics at the Ludwig Maximilian University of Munich. From 1933 to 1934, he additionally studied philosophy at the Pontifical Gregorian University in Rome.
Martin earned his first and second Staatsexamen in 1932 and 1937 and joined the Bavarian judiciary.
In 1939, Martin was appointed an investigating judge, later a criminal judge and a scientific associate at the Reichsanwaltschaft. In October 1939, he was appointed district attorney in Nuremberg and Fürth, and in February 1940 in Leipzig. However, as he was conscripted into military service from 1939 to 1945, he never actually worked as a district attorney.
In 1946, Martin was appointed a judge in Sonthofen, and in 1950, he was employed in the Federal Ministry of Justice. In 1951, he was appointed Oberstaatsanwalt in the Generalbundesanwaltschaft, and in June 1952, he was appointed Federal Attorney (Bundesanwalt). He was appointed a federal judge in 1953, serving for ten years until 1963, mostly as a criminal judge at the Federal Court of Justice of Germany.
In 1963, Martin was appointed Attorney General of Germany. During his term of service, the Spiegel scandal and the Guillaume Affair took place.