The purpose of the study is to evaluate the critical thinking dispositions of the prospective science teachers. In this study, the survey methodology was used. The sample of the study consisted of 309 prospective science teachers (freshman, sophomore, junior, senior) at Elementary Science Education Department, Faculty of Education of a public university. Data was collected by using "The California Critical Thinking Disposition Inventory (CCTDI)" which was developed by Facione et al. (1998) and was adapted to Turkish by Kokdemir (2003). According to the results indicated that the critical thinking dispositions of prospective science teachers' were in general at medium and low levels. (C) 2013 The Authors. Published by Elsevier Ltd.