The aim of this study is to define the second grade primary school students’ dispositions towards critical thinking. Upon notifying the dispositions on critical thinking, by concerning regional discrepancies, this research is put into process with 615 second grade students from one state and one private school in two different regions. The data of this study has been collected using “The Critical Thinking Disposition Inventory” translated to Turkish by Kökdemir (2003). The reliability of the scale, applied to second grade primary school students, is found as 0,79. In this context, there emerged differences based on school and class in the critical disposition levels of the second grade primary school students who are studying in the state and the private school in different regions. In conclusion, the necessity of creating teaching environments which leads students to critical thinking, that is, being open to new ideas, questioning and evaluating knowledge, is made explicit.