Abstract This research aimed at studying the impact of a learning strategies-based program on improving EFL Iraqi Preservice Teachers' writing skills. The participants of this research were (30) EFI Iraqi Preservice Teachers at Tikrit University. The research adopted the quasi-experimental design using two groups: an experimental group (n = 30), and a control one (n = 30). To collect data, the researcher used one instrument; an EFL writing skills test. The researcher taught both groups: the experimental group was taught through a learning strategies-based program, while the control group was taught through the regular method of teaching. Research results revealed that there were statistically significant differences between the mean score of the experimental group and the control group students in the EFL writing skills test. Moreover, the effect size of the program was found to be high. Therefore, this research recommended using a learning strategies-based program in teaching the four skills of the English language at different university levels.                                             Keywords: Learning strategies, Preservice Teachers, writing skills, EFL