Ludwig Lange was a German architect and landscape designer.

He was the son of a court official and began his training as an architect in 1823 under church designer Georg August Lerch. From 1826 to 1830, he attended the University of Gießen where he studied with Georg Moller. His studies continued in Munich, where he was a pupil of the landscape painter Carl Rottmann, with whom he undertook a study trip to Greece in 1834.

In 1835, he was appointed to be a drawing teacher at the New Royal High School in Athens and, on 15 May, became a building inspector for King Otto I. He returned to Germany in 1838 and travelled extensively there. In 1847, he was appointed to succeed August von Voit as Professor of Architecture at the Academy of Fine Arts Munich.

He is best known for a large series of lithographs (produced in conjunction with his brothers Georg, Gustav and Julius) depicting examples of Gothic architecture in the Rhine Valley; and (with Ernst Rauch) steel engraved views of prominent German cities. From 1846 to 1855, he published his designs as Works of Higher Architecture; encompassing three volumes. The Royal Villa in Berchtesgaden and the Museum der bildenden Künste in Leipzig (1856–1857) were built from his designs. His style was a mixture of Classical and Italian Renaissance elements.