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An increasing number of studies have examined whether and how principal instructional leadership influences teacher attitudes. However, the impact of principal instructional leadership on teacher collegiality and self-efficacy has not been explored simultaneously. The study investigated a moderation model of principal instructional leadership and teacher self-efficacy. Survey data were collected from 1498 teachers and 53 principals in 53 middle schools in Henan, China. The finding indicated instructional leadership has a positive impact on teacher self-efficacy. More importantly, teacher collegiality moderated the relationship between principal instructional leadership and teacher self-efficacy. This study extends the relationship between principal instructional leadership and teacher self-efficacy and emphasizes the importance of teacher collegiality in promoting the effectiveness of instructional leadership.