In line with the approaches of learning that emphasize the social and contextual aspects of learning, there is a growing demand on collaborative professional development models. Lesson Study is a vocational development model that a group of teachers working with the cooperation of a target frame denominated "research class" in which they plan for classes, teach and evaluate. This study aims to examine postgraduate theses and articles focusing on lesson study to identify the trends in a comprehensive manner. The data of this research were collected by document analysis. For the purpose of this study, 14 master, 25 doctorate theses and 15 articles were indexed in TR completed in year between 2010-2019 were analyzed by using content analysis in Turkey. Frequency and percentace ratio involving data were presented by tables. The studies were classified within type of research, year of publication, approach of research, design of research, sample, subject and data analysis technique. The research results show that the doctorate thesis is more abundant than the master thesis as the thesis type and qualitative studies are predominant as research approach. It was observed that the participants of most of the examined studies were teachers. It was seen that case study is mostly preferred as a research design and using content analysis. As a review study, the present study was carried out in order to introduce lesson study construct to researchers and evaluate which aspects of lesson study were studied in Turkey and finally, make recommendations in light of the analysis of the studies for further research.