Walther Franz Anton von Dyck (6 December 1856 – 5 November 1934), born Dyck (German pronunciation: [diːk][1]) and later ennobled, was a German mathematician.

He is credited with being the first to define a mathematical group, in the modern sense in (Dyck 1882).

Von Dyck was a student of Felix Klein[2] and served as chairman of the commission publishing Klein's encyclopedia.

Von Dyck was also the editor of Kepler's works.

He promoted technological education as rector of the Technische Hochschule of Munich.