This study examined the relationships among first-year students' employment, engagement, and academic achievement using data from the 2004 National Survey of Student Engagement. A statistically significant negative relationship was found between working more than 20 hours per week and grades, even after controlling for students' characteristics and levels of engagement. An examination of the indirect relationships between work and grades revealed that working 20 hours or less on campus was significantly and positively related to grades, acting through student engagement. (Contains 3 tables and 1 figure.)