eng Science and Education Publishing American Journal of Educational Research 2327-6150 2018-12-06 6 12 1593 1599 10.12691/education-6-12-1 EDUCATION20186121 article Vina Serevina vina.serevina77@gmail.com 1 Wawan Andriana 1 Anan Fernandianto 1 Physics Education, State University of Jakarta, East Jakarta, Indonesia The purpose of this research is to know whether guided inquiry learning model can improve student's creative thinking ability of class X-1 Public High School 59 Jakarta. This research is a classroom action research according to Kurt Lewin model: (1) planning, (2) acting, (3) observing, and (4) reflecting. Research was conducted from January 2017 to June 2017 with 36 students at Public High School 59, class X-1, Jakarta, Indonesia as experiment subject. Data was collected through observation, written test and documentation. The result of student's creative thinking ability obtained by 52,00% for fluency aspect in cycle 1 and 60,57% in cycle 2. Flexibility aspect increased from 44.29% in cycle 1 to 55.71% in cycle 2, originality aspect increased from 49, 52% in cycle 1 to 59,05% in cycle 2, and elaboration aspect increased from 45,71% in cycle 1 to 58,57% in cycle 2. According to the obtained data, it can be concluded that guided inquiry learning model can improve student's creative thinking ability in fluency, flexibility, originality, and elaboration aspects. http://pubs.sciepub.com/education/6/12/1/education-6-12-1.pdf creative thinking ability guided inquiry learning model