Recruiting more female faculty has been suggested as a policy option for addressing gender disparities in science, technology, engineering, and mathematics (STEM) fields given its ability to engage female students through a role model effect. While a small but growing body of literature has examined the role of instructor gender at the higher education level, it typically focuses only on academic outcomes. This paper utilizes a unique data set that includes not only information about student course performance in STEM but also a number of motivation-related measures. We find that having a female instructor narrows the gender gap in terms of engagement and interest; further, both female and male students tend to respond to instructor gender. We conclude by discussing the policy implications of these findings.