The current study examined the potential contribution of advanced Korean EFL learners’ writing abilities to their reading comprehension abilities. A total of 191 college students participated in this study and were tested on writing and reading comprehension abilities as well as other literacy-related measures including listening comprehension, textreading fluency, and knowledge of vocabulary to control for their effects. In order to account for different aspects of writing and reading comprehension abilities, multiple measures of reading and writing abilities were adopted. The Structural Equation Modeling (SEM) analyses demonstrated that the advanced Korean EFL learners’ English writing abilities had a significant effect on their reading comprehension abilities when other relevant literacy skills were controlled for. Furthermore, their writing abilities mediated the relationship between vocabulary knowledge and reading comprehension abilities. These results highlight the important pedagogical implications on the critical role of writing abilities in enhancing the reading comprehension abilities of L2 learners.