Otto Bartning (12 April 1883 in Karlsruhe – 20 February 1959 in Darmstadt) was a Modernist German architect, architectural theorist and teacher.

He set off for an 18-month world tour in March 1904 (older sources incorrectly claim this journey was from 1902 to 1903), after which he settled down to complete his studies in Berlin and Karlsruhe.

Bartning became known as an early reformer of art and design education after the First World War together with his friend, Walter Gropius, among others.

In 1927, for example, the weaving department produced material for the German Pavilion at the Milan Fair, designed by Otto Bartning's architectural office.

His writings in the magazine Die Volkswohnungen ('People's Housing') appear among polemics advocating land reform and a craft-based self-sufficient Germany.