This study was carried out as a survey to determine weed species, their observationfrequencies and densities in wheat fields of seventeen districts of Diyarbakır province during2016-2017. For this purpose, field observations were made in total 106 location and the weedspecies and their frequency and densities were recorded. As a result of the observations; 107weed species belonging to 26 families, 1 seedlees, 19 monocotyledons, 87 dicotyledons weredetected. Families of Asteraceae, Poaceae, Brassicaceae, Apiaceae and Fabaceae, which arethe most dominant in the fields and containing 2/3 of all species have been found in survey.Avena fatua L., Sinapis arvensis L., Ranunculus arvensis L., Galium aparine L. ve Cirsiumarvense (L.) Scop. were identified as the most common species respectively, and their ratiosare 87, 78, 72, 62 and 58%. According to density Avena fatua L. with 9.73 plant m2hasreceived the first place. It was followed by Sinapis arvensis L., Galium aparine L., Papaverrhoeas L., Cirsium arvense (L.) Scop. with the numbers of 8.83, 5.94, 2.62 ve 2.45 plant m2respectively. Despite the decrease in frequency and density of weeds compared to pastyears, the results obtained have shown that effective weed management is not exercised.