INTRODUCTION: Tobacco use remains a serious problem for young adults. Given the large number of young adults attending college, a tobacco-free campus is one strategy to reduce tobacco use. Young adult engagement is recognized as a common strategic practice in tobacco control policy efforts, especially in changing social norms around tobacco use. Community colleges can leverage and engage students in adoption of campus 100% tobacco-free policies. This qualitative study examines the importance of student engagement in advancing 100% tobacco-free policies in community colleges and identifies strategies for campuses to involve students in such efforts. METHODS: We selected 12 community colleges and conducted key informant interviews with campus and community-based organizations that were involved in campus policy adoption efforts. We conducted 33 semistructured interviews and transcribed, coded, and analyzed them by using a thematic analytic framework with inductive and deductive approaches to examine student engagement processes. RESULTS: Community colleges represented campuses with (n = 6) and without (n = 6) tobacco-free policy and varied by geography (urban vs rural) and student population size. Three main themes emerged: 1) no "wrong door" for students to engage in tobacco control work, 2) a myriad of ways for students to be involved in policy adoption, and 3) benefits of student engagement. CONCLUSION: We found that students are doers, allies, and champions in adoption of 100% campus tobacco-free policy. Colleges should leverage their campuses' most important assets - students - to be agents of change and to involve them in the full spectrum of interventions and advocacy.