Feedback literacy as a knowledge vital for developing EFL learners’ academic writing might be associated with several factors, including learners’ second language (L2) writing engagement. Besides, variables such as learners’ proficiency levels can affect the relationship between feedback literacy and writing engagement. This study investigated the relationship between 234 elementary (n = 85), intermediate (n = 78), and advanced (n = 71) Iranian English as a Foreign Language (EFL) learners’ writing feedback literacy and writing engagement selected based on convenience sampling. After taking a placement test, they sat for a writing task adjusted to their proficiency level. Next, they answered a scenario-based L2 Writing Engagement Measure (WEM) and completed the Writing Feedback Literacy Questionnaire (WFLQ). The Spearman rank-order correlation indicated significant positive relationships between the three groups’ feedback literacy and writing engagement. However, there were no significant differences in the relationships between EFL learners’ feedback literacy and writing engagement across the three groups. The study’s findings provide insights for L2 teachers, teacher trainers, and educationalists to enhance students’ writing ability, feedback literacy, and writing engagement. Some suggestions for further research are proposed.