Ernst-Joachim Mestmäcker (born 25 September 1926) is a German lawyer. He was professor of private law at Georgetown University, Saarland University, University of Münster, University of Bielefeld, University of Hamburg, and University of Michigan, Ann Arbor. From 1984 to 1990 he was director of the German Max Planck Society.[1] He is on the editorial board of the academic journal ORDO and member of the European Academy of Sciences and Arts.
Mestmäcker was awarded the German Federal Cross of Merit, First Class, in 1981 as well as the order Pour le Mérite for accomplishments in the arts and sciences in 1997.