The aim of this study is to determine the trends of the postgraduate dissertations conducted relevant to project-based learning in Turkey between 2000 and 2019. For this purpose dissertations are; The universities and years in which they were written were examined from different dimensions such as research methods, sample numbers and levels, sample selection methods and dimensions, data collection tools and dependent/independent variables inspected. A total of 174 theses in the scope of the study were examined. Findings obtained from the study showed that a significant part of the theses were carried out in Gazi, Marmara and Hacettepe universities. While it is seen that a significant part of the research approaches used in theses are quantitative research approaches, the frequency of use of qualitative and mixed research approaches has increased in recent years. Depending upon the frequency of use of quantitative approaches, it is determined that quasi-experimental design research methods are pretty much used in dissertations. In terms of data collection tools, it has been observed that different types of scales are widely preferred in dissertations, followed by success tests, interviews and questionnaires. At the sample levels, it was determined that middle school, undergraduate, primary school students and teachers are the most used groups. While it was seen that the number of studies not specifying the sample selection methods was quite high, 31-100 and 11-30 people were used more in theses in terms of sample numbers. Finally, it was observed that different variables such as academic success, attitudes towards different situations and concepts, and teacher/parent views were examined as dependent variables in dissertations.