This study was conducted with the aim to determine to what extent 5th grade Turkish text books included critical thinking strategies. In the study, it was examined whether course books included 5 dimensions of cognitive strategies or not. In this study, qualitative and quantitative research designs were used together. Document review was used as qualitative data collection method and 22 texts in 5th Grade Turkish text books published by Ministry of National Education and a private publishing house taught in Province of Sakarya were reviewed. This data collection tool developed was applied to the texts in accordance with the concepts determined by three individual researchers and checking process of the concepts was performed. As a result of the research, it was concluded that the texts in 5th grade Turkish text books prepared by National Education Publishing House included the strategies for developing critical thinking skills of students more than the texts in 5th grade Turkish course books prepared by the private publishing house. In addition, it was seen that both National Education Publishing House and private publishing house did not include the critical t hinking dimensions to the required extent.