The aim of this study is to examine and determine the extent to which educational drama, as an innovative teaching approach, can cultivate critical thinking of students in primary school. Based on the principles of educational drama, 15 theatrical workshops were designed in relation with and corresponding to the culture and interests of the specific age group. The experimental method that was followed, was designed and implemented in three discrete stages including: the pre-research stage, the main research stage and the results extraction stage. The sample comprising 400 students aged 8-10 has been drawn from six different primary schools in Greece, the subjects of which were randomly selected. Five critical thinking skills were studied, including subtraction, induction, observation, reliability, detection and troubleshooting skills. The qualitative and quantitative data collected was next triangulated in order to lead to the desired result. The results confirmed the main research hypothesis, hence educational drama, as an innovative method, can enhance students' critical thinking in primary school.