Objective: Assess impact and feasibility of a Tobacco-Free Ambassador Program on campus policy compliance. Participants: Trained Ambassadors made 253 visits to campus sites over 15 months to observe and/or approach violators. Methods: Policy violators were observed at 23 locations during Wave 1 (April-June 2012) and/or Wave 2 (April-June 2013). For locations with at least 5 visits, average violators per visit were compared between the 2 waves using a paired t test. Attributes of violators were summarized. Cigarette butts were collected over 3-day periods in 4 campus hotspots during each wave. Personnel time and cost to implement the program were determined. Results: There were declines in observed violators per Ambassador visit and number of cigarette butts over time. Rate of violators per visit declined from 5.47 to 1.93, a 65% decrease. Personnel time was equal to 1.5 full-time equivalents annually. Conclusions: The Ambassador Program was a feasible and potentially effective strategy to increase policy compliance.