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Students are facing more complex challenges in the era where they have to master science, technology and engineering. The 4.0 industry revolution requires critical thinking in competing and absorbing information. The fact is that in elementary schools thematic learning is lack in developing the critical thinking ability. This study aimed to determine the effect of STEM approach in improving critical thinking ability of elementary students. The research was conducted in November 2018 at Griya Bandung Indah Elementary School, Kabupaten Bandung. The type of research design was one group pretest-posttest design with purposive sampling. The research instrument used was an essay questions test instrument. The data were analyzed by statistical test using SPSS. The results of data analysis found that there was a significant effect of the average critical thinking skills outcomes of students learning using STEM approach.