This study is a content analysis of theses concerning cooperative learning prepared in Turkey between the years 1993 and 2014. A total of 220 theses which were accessible online (open access) at the site of Council of Higher Education (CoHE) were analyzed. The publishing classification form used in this study was prepared analyzing similar forms in the literature. Each thesis was subjected to content analyses using this form and the data were stored in electronic media. The data were analyzed and are presented in graphics, frequency and percentage tables, and in a descriptive manner. Results show that theses on the topic of cooperative learning increased in large numbers with the adoption of the 2005 constructivist learning curriculum. Results also show that most often quantitative methods were used, the effect of the method on academic success was studied, and percentage and frequency tables in particular were used as the data analysis technique.