Karl Jettmar (August 8, 1918 - March 28 , 2002 ) was an Austrian ethnologist, religious scholar and archaeologist. he was the son of the Viennese painter Rudolf Jettmar and studied at the University of Vienna from 1936, first in German and history, then in ethnology, folklore and prehistory. He received his doctorate in 1941 After his military service, he initially couldn't find a job as a scientist, but had to earn his living as a salesman. In 1953/54 he was a visiting scientist at the Frobenius Institute in Frankfurt am Main, then until 1958 he was an assistant at the Museum of Ethnology in Vienna.

In 1961 he accepted an appointment as a full professor of ethnology at the University of Mainz. From 1964 until his retirement in 1986, he was professor of ethnology at the University of Heidelberg, director of the South Asia Institute and from 1969 he was a full member of the Heidelberg Academy of Sciences.

Jettmar retired in 1983 abut continued to publish works on the indigenous religions, art and prehistory of Central Asia. In 1999 he became honorary member of the German association of anthropologists (Deutsche Gesellschaft für Völkerkunde, DGV).