Rudolf Junk was an Austrian graphic artist and painter. He designed numerous Austrian kroner and schilling banknotes.

Junk, son of the construction technician David Valentin Junk and his wife Wilhelmine nee Klier, first attended kindergarten and elementary school in Vienna before moving to the Melk Abbey High School in 1894. There Leopold Blauensteiner and Richard Kurt Donin (the two later made a name for themselves as painters and art historians) were among his classmates. He then studied German and (Celtic Philology) at the University of Vienna, where he in 1903 based on the dissertation on the Bamberg formula of faith and confession and the piece of heaven and hellto the Dr. phil. was awarded a doctorate. From 1903 to 1908 he attended Heinrich Lefler's special school at the Academy of Fine Arts in Vienna.

From 1909 he worked as a graphic designer for the Austrian State Printing Office and until his death designed a total of 24 (put into circulation) banknotes, as well as securities, postage and postage stamps. From 1909 to 1922 he was a member of the Vienna Hagenbund, from 1912 to 1918 artistic advisory board of the Academy for Music and Performing Arts Vienna and from 1924 to 1943 director of the graphic teaching and research institute in Vienna.

His brother Victor Junk (1875-1948) was a music and dance scholar.