The growing perception of the engineering profession as a sociotechnical discipline has provided rich soil to cultivate leadership within a professional context. While skill-and behavior-based approaches are ubiquitous in engineering leadership programs, identity is emerging as a powerful framework for understanding engineering leadership development. This practice paper presents the design and implementation of an identity-based engineering leadership instructional module, along with empirical evidence assessing its impact on student leader identity and understanding.While many university programs focus on leadership skills or behaviors, a growing literature base suggests that seeing oneself as a leader is a powerful influence on long-term leadership development. Identity--or how one sees oneself, and is seen by others, in society-provides insight into the dynamic, multi-faceted and individual nature of leadership development. This research builds on emerging research that has identified potential features of an identity-based instructional approach, but it is not yet clear how one might operationalize this approach or what its impact might be on the engineering leadership development of college students.The primary purpose of the practice paper is to present a short-term activity that models an identity-based approach (reflexive instruction) to engineering leadership instruction. By using a modular format that can be easily scaled, this research presents instructional activities that can be applied easily in a wide spectrum of courses, from introductory engineering to senior capstone classes. The lessons take 1-2 class periods; they are based on easily accessible resources; and they require minimal preparation by instructors. Activities include an introduction into several leadership styles, a teamwork activity, class discussion, and two essays.In addition, this paper summarizes the impact of reflexive instruction interventions. Undergraduate student participants at multiple universities were surveyed on their leader identity and engineering leadership understanding. Self-reported retrospective surveys were analyzed to measure instructional impact. Two research questions drove the quantitative analysis: Does reflexive instruction about engineering leadership influence leader self-identity; and does it influence engineering leadership understanding? Findings from a multi-institution implementation of this activity indicated both that leader identity increased, and that leadership understanding shifted over the timeframe of the intervention. These findings suggest that students respond well to an identity-based leadership approach. This has implications for research, as it contributes to our understanding of how students may be affected by identity-based initiatives. More relevantly, this has implications for practice, as it models one approach to engineering leadership growth, with empirical support for its impact. This may hold particular importance to LEAD Division members as an empirically grounded activity t...