The purpose of the current study is to determine the trends in M.A and Ph.D. theses on socio-scientific issues. To this end, thesis studies completed between 2008 and 2018 on socio-scientific issues were analyzed in terms of the year of thesis and publication type, the university where the thesis is done, the purpose of the thesis, research methods and designs, study groups and their size, data collection tools and the socio-scientific issues preferred for investigation. The thesis studies analysed in the current study were reached from the Higher Education Council Thesis Search Centre Database in Turkey. As a result of the current study, it was determined that such thesis studies started in 2008, the great majority of them are master's theses, the quasi-experimental design, one of the quantitative research methods, was frequently used, documents were generally used as the data collection instruments and pre-service teachers were used as the study groups in most of them. Moreover, in these thesis, the effect of instructional applications directed socio-scientific issues on the related variable (mostly argumentation skill/quality/ability and decision-making skills) has been frequently investigated and the most popular socio-scientific issues selected in these theses were found to include global warming, climate change and nuclear energy. In light of the findings of the current study, suggestions were made for future research and applications to be conducted on socio-scientific issues.