The main aim of this study is to investigate the effects of an English language education program that addresses the academic and cognitive needs of gifted children on their academic achievement and creative thinking levels. To this end, through an experimental research design, the unit "Health Problems" in English course book was differentiated for gifted students at Grade 5 and the effects of this differentiation on the students' creative thinking levels and academic achievements were examined. Due to the experimental nature of the study, the Randomized Pre-test Post-test Control Group Design was used. The research was conducted with the students who were randomly assigned to control and experimental groups, according to the results of the Raven SPM Test and Torrance Test of Creative Thinking. The Raven SPM Test and Torrance Test of Creative Thinking were applied in the study. The participants of the study consist of 24 gifted students at Grade 5 in Beyazit-Ford Otosan Primary School that is the only mainstream primary school for gifted students in Turkey. The study was conducted in 2011-2012 academic year. The data were analyzed by means of Mann Whitney-U and Wilcoxon Signed Ranks tests. The findings showed that the differentiated English language education program for gifted students significantly improved their creative thinking levels and academic achievement. [This study was presented at the 11th Good Examples in Education Conference organized in 2014 at the Sabanci University as a poster presentation.]