The purpose of this study is to examine the learning outcomes in the curriculum of Biology course in terms of reflective thinking skills. It is a documentary qualitative research. The target area of the study is the curriculum of the Biology course in secondary school level. Biology course curriculum of grades 9-12 was included in the research without any sampling in the research. Data collection method of the research is document analysis, and data analysis method is content and document analysis. We find that the vast majority of the learning outcomes of the units and subject areas in the biology course curriculum are in the practical reflection level. While the learning outcomes of the biology course curriculum are determined, mental skills need to be taken into account.