The eastern Palearctic species of Dusona Cameron are revised. A key and descriptions are provided for 173 species. 68 species are described as new. The following new synonymies are indicated: Dusona americana (Ashmead, 1890), syn. D. oyamadai Hinz, 1994; D. annexa (Foerster, 1868), syn. Campoplex limnobius Thomson, 1887; D. bicoloripes (Ashmead, 1906), syn. C. foersteri Roman, 1942; D. circumcinctus (Foerster, 1868), syn. Campoplegidea melanocerus Uchida, 1932, ? syn. Delopia nigrifemur Sonan, 1929; D. glauca caliginosa (Walley, 1940), syn. D. latisulcor Hinz, 1994; D. mercator (Fabricius, 1793), syn. Campoplex oxyacanthae Boie, 1855, syn. C. mesoxanthus Foerster, 1868; D. meridionator Aubert, 1960, syn. D. kyushui Hinz, 1994; D. pugillator (Linnaeus, 1758), syn. D. amictor Hinz, 1979, syn. D. scutellatoides Hinz, 1985. A lectotype is designated for C. foersteri Roman.