Baron Omar Rolf von Ehrenfels (born 28 April 1901 in Prague - died 7 February 1980 in Neckargemünd, Heidelberg, Germany) was a prominent Muslim of Austrian origin.
Omar, or as he later chose, Umar Rolf Ehrenfels was born 28 April 1901 in Prague, Austria. He was baptised Rolf Werner Leopold von Ehrenfels. His father was Roman Catholic Baron Christian von Ehrenfels (1859–1932) professor of philosophy at the German part of Prague University. He is known as the founder of the Gestalt theory. His mother was Emma von Ehrenfels (1862–1946) born André, in Bratislava (Pressburg). In her parental home both German and Hungarian was spoken. During World War I she worked for the Red Cross caring for Hungarian wounded soldiers. Widowed of her first marriage she brought her daughter Elfriede (Elfi) Hartmann into their home. The second daughter, known as the author Imma von Bodmershof (1895–1983), was born in Graz. Rolf as the only son of Christian Freiherr von Ehrenfels inherited the title but he had to discard it according to new Austrian laws in 1920. As a convert to Islam he took on the name Omar or Umar, kept Rolf and omitted the others. 1932–37 he was a student of social anthropology (Völkerkunde) at Vienna University and got a doctorate there. At the Nazi occupation of Austria, Anschluss, 13 March 1938, he emigrated to India. There he lived until 1961, since 1949 as lecturer, later professor of social anthropology at the University of Madras. Umar Rolf Ehrenfels died 7 February 1980 in Neckargemuend, Germany having been guest professor at Heidelberg University and co- founder of its South Asia Institute 1961-71. Elfriede von Bodmershof (1894–1982) was his wife 1925–1948. The couple was separated due to the Nazi occupation of 1938. Later Ehrenfels married the French social scientist Mireille Abeille (1924–2007).
Rolf Ehrenfels was an Austrian citizen all his life. Lichtenau near Krems and Gföhl in Lower Austria was his home parish. Since 1813 the Ehrenfels family were settled in Schloss Lichtenau. Also the castles Brunn im Walde and Rastbach were family properties. Rolf's eldest sister "Elfi" Elfriede Hartmann married a widower with three children and had her own home from the early 1920s. His sister Imma Ehrenfels married Wilhelm "Willy" (von) Bodmershof (Schuster)and they settled at Rastbach castle for life. In 1925 there was a double wedding as Rolf Ehrenfels married Willy's sister Fridl who became Elfriede Ehrenfels She was born in Trieste, Austria.