The purpose of this study was adapting an instrument into Turkish which is developed by a research group in California University for identifying pre-service science teachers' epistemological beliefs toward chemistry. The adapted instrument is a likert type instrument with five scales, includes 18 items and it was applied to 100 pre-service sicence teachers to determine their epistemological beliefs in 2009-2010 spring semester. The reliability of the instrument was found as .59. It was concluded that this adapted instrument can be used to determine teachers' and students' epistemological beliefs toward chemistry. (C) 2011 Published by Elsevier Ltd. Open access under CC BY-NC-ND license.