The purpose of this study was to investigate the effect of using Design Thinking on enhancing EFL professional diploma students' academic writing skills. The study employed the one-group pretest-posttest quasi – experimental design. The participants were 9 professional diploma students in the department of curriculum and instruction, the Faculty of Education, Ain Shams University. The instruments of the study included an academic writing test and a scoring rubric. The academic writing test was pre administered to the study group. Then the study group was trained through the proposed design thinking model of academic writing (RipiR). The academic writing test was then post administered to the study group. Quantitative data were collected from the participants' scores on the pre/ post academic writing test, whereas qualitative data were gathered from the participants' reflections and samples of their writings. Findings of the study revealed that the proposed program had a very strong effect on developing participants' academic writing skills.