Josef Fahringer (21 December 1876 - 18 December 1950) was an Austrian entomologist from Vienna.
He obtained a doctorate at the University of Vienna in 1904 and taught in Vienna from 1904 to 1907. He then taught at Brüx from 1907 to 1910 , at Brünn from 1910 to 1913 and again at Vienna from 1918 to 1936. He published the first modern monograph on Braconidae: Opuscula braconolocica (4 parts, 1925-1937). A specialist in this group, he wrote many other scientific papers on them and other parasitic Hymenoptera.