The aim of this study is to determine the thinking styles of teacher candidates and examine the impact of inquiry-based laboratory applications on thinking styles. This research was designed as an experimental model based on a control group with pre- and post-tests. Data were collected by applying the "Thinking, Styles Inventory". The thinking styles of teacher candidates developed differently, depending on traditional laboratory and inquiry-based laboratory applications. When post-test scores of thinking styles were examined, there was an increase in the scores of teacher candidates. Therefore, it can be concluded that-traditional laboratory and inquiry-based laboratory applications are effective for developing the thinking styles of teacher candidates.