Two species of gall midges, Dasineura oleae (Angelini 1831) and Lasioptera oleicola Skuhravá 2011 (Diptera: Cecidomyiidae), on leaves and shoots of Olea europea L. were reared in Hatay Province, Turkey in 2007-2010. In the study as main mortality factors of the gall midges were 11 species of larval/pupal parasitoids from 5 families of Hymenoptera, Platygasteridae: Platygaster oleae Szelenyi 1940, Eupelmidae: Eupelmus urozonus Dalman 1820, Torymidae: Torymus phillyreae Ruschka 1921, Pteromalidae: Mesopolobus mediterraneus (Mayr 1903), M. diffinis (Walker 1834), M. aspilus (Walker 1835), Eulophidae: Anaprostocetus acuminatus (Ratzeburg 1848), Quadrastichus dasineurae Doğanlar et al. 2009, Aprostocetus samandagus sp.new, Aprostocetus lasiopteru sp.new, Zeytinus hatayensis gen.and sp. new. The new taxa were described and their diagnostic characters and some biological data are gIven. An identification key for the parasites was provided