Empirical research suggests that school leaders' instructional leadership can make a difference in improving student achievement. We explored this issue in a mixed-method study that sought to verify whether or not, from participants' perspectives, school principals enact this type of leadership and whether or not they feel that it affects student outcomes. The research included a sample of top-level school leaders in a Portuguese region. We analyzed the data with descriptive statistics and content analysis techniques. Participants reported that most of principals' leadership practices did not focus on student learning, but rather on school administration and management. Many respondents felt that it was not their job to lead in several instruction-related areas. Furthermore, respondents regarded the impact of most of principals' instructional leadership practices on student achievement as weak. The paper discusses possible reasons for these findings, including the contextualized nature of the exercise of principal leadership roles, and suggests future avenues for research on this issue.