The purpose of this study is to examine the effect of Flipped Classroom Instruction (FCI) on Iraqi EFL learners' writing skills. Participants included 66 students in the College of Languages English Department at Salahaddin University. The study employed a mixed method of data collection, utilizing pre-and post-writing tests as well as a questionnaire for both groups and interviews conducted with the experimental group. Findings indicated that a statistically significant difference existed between the control and experimental groups and, more specifically, the students of the experimental group performed better on the writing tests than the students of the control group. The majority of the learners' attitudes towards FCI were positive.