Wilhelm Marx (January 15, 1863– August 5, 1946) was a German lawyer, Catholic politician and a member of the Centre Party. He was Chancellor of the German Reich twice, from 1923 to 1925 and again from 1926 to 1928, and also served briefly as minister president of Prussia in 1925, during the Weimar Republic.

Born in Cologne to a teacher, Marx passed his Abitur at the Marzellengymnasium in 1881. He then studied jurisprudence at the University of Bonn. As student he became a member of K.St.V. Arminia. After his degree in law, he worked as an assessor in both Cologne and Waldbröl and later in the land registry in Simmern. From 1894 Marx worked as a judge in Elberfeld. Ten years later, he returned to Cologne and Düsseldorf, where he had the highest rank possible in Prussia for a Catholic who was also active in the Centre Party.

Marx married Johanna Verkoyen in 1891 and they had four children.

He served as Chancellor of Germany from 1923 to 1925 and again from 1926 to 1928, and was the Centre Party's (and, in the second round, the entire Weimar Coalition's) candidate in the 1925 presidential election. But in the runoff he was defeated by Paul von Hindenburg, as Ernst Thälmann the Communist candidate also stood and split the vote.