The present study aimed to explore the relationship between reading motivation, reading engagement, strategy use, and L2 reading proficiency and the predictability of the first three factors on L2 reading proficiency in a group of Iranian EFL learners. The participants were selected based on a nonrandom purposive sampling technique. They were asked to complete the MRQ, reading engagement questionnaire, the SILL, and an IELTS reading test. The data were analyzed using the SPSS software. The findings indicated that there existed a meaningful positive relationship between reading motivation and L2 reading proficiency as well as reading engagement and L2 reading proficiency. There did not exist a positive relationship between strategy use and L2 reading proficiency. The results also revealed that reading motivation and reading engagement predicted the L2 reading proficiency of the participants. Furthermore, a significant difference existed among the low, intermediate, and high-proficient L2 readers in terms of reading motivation and reading engagement. Implications of the study are presented in the article.