There is a positive relationship between high levels of teacher efficacy and increased student achievement as well as a positive link between principal behavior and teacher efficacy. A diverse group of middle school teachers from a mid-Atlantic state were surveyed. Responses from 366 teachers were analyzed to determine whether various principal behaviors affected the efficacy of new and experienced teachers differently. Findings suggest that teacher efficacy is significantly affected by principal behaviors based on years of teaching experience. (Contains 6 tables.)