The present study sought the differences between more and less proficient EFL (English as a Foreign Language) writers regarding their metacognitive awareness of writing (MAW). We also examined the relationship between MAW and EFL writing success. We used a validated MAW questionnaire for a comprehensive evaluation of the writers' metacognitive awareness. The results demonstrated that skillful EFL writers benefit from higher metacognitive awareness. Furthermore, we found that metacognitive awareness (and its sub-categories) is positively correlated with writing proficiency, except for avoidance strategy which showed a negative correlation. The mixed design of this study which is a part of a larger project would help researchers to gain new insights into the role of metacognitive awareness in EFL writing success.