The purpose of this study is to carry out a thematic review of graduate theses published in Türkiye about 21st-century skills. The thematic review process, a holistic perspective on 21st-century skills will be provided and it will guide researchers who want to research on the subject. According to the fact that the graduate theses are published by the National Thesis Centre in Türkiye, a total of 133 graduate theses were reached. In the study in which the document analysis method was used, graduate theses were analysed using the analysis matrix. In the analyses matrix, there were seven themes: year and type, region of publication, subject, preferred approach type, method and model used, research group/sample/participant group, and emphasised results. When the obtained data were analysed, it was found that the number of graduate theses published in Türkiye about 21st-century skills has increased significantly in the last three years; a higher number of graduate theses were published in Central Anatolia and Marmara Regions; graduate theses conducted to determine the relationship between variables/demographic variables and teaching methods and techniques with these skills have a high rate in the subject area; the number of theses based on quantitative approach is higher than the number of theses based on other approaches; the number of theses in which descriptive research methods are preferred differs significantly from the number of theses in which other research methods are preferred; in the research group variable, studies were carried out with groups such as pre-service teachers, teachers, students, administrators, documents and academics; the effect of variable/demographic variable and the effect of teaching methods and techniques on 21st-century skills were highly emphasised. The study's results provided guiding recommendations to academics interested in studying 21st-century skills.
21st-century skills, graduate theses, thematic review