The purpose of this sequential explanatory mixed-methods case study was to investigate the effects of English language learning on creative thinking skills in the domains of fluency, flexibility, originality, and elaboration as measured with the Alternate Uses Test. Unlike the previous research studies that investigated the links between English language learning and cognitive skills and had large numbers of participants, this research study relied on small group of participants to provide detailed information about the effects of English language learning on their creative thinking skills in the domains of fluency, flexibility, originality, and elaboration as measured with the Alternate Uses Test. This study involved the collection of quantitative data at the pretest and posttest stages and the explanation of the quantitative data using qualitative data. The quantitative findings of this sequential explanatory mixed-method case study indicated that there were no statistically significant differences between the pretest and posttest results in the domains of fluency, flexibility, originality, and elaboration as measured with the Alternate Uses Test.