The purpose of this research was to explore the relationships between Machiavellian orientations of elementary and secondary school principals and aspects of teacher-principal relations. Data were collected from faculty members and principals in 40 elementary and 40 secondary schools in New Jersey. A set of hypotheses and research questions was tested using analysis of variance and correlational techniques. The Machiavellian orientation of principals was not significantly related to the prinicpal's behavior in terms of initiating structure, consideration, authoritarianism, emotional detachment; nor was it related to openness (or closedness) of school climate, teacher loyalty to the principal, teacher loyalty to the school, or teachers' rating of the effectiveness of the principal. Machiavellianism of principals, however, was found to be significantly related to job mobility. Contrary to the findings of the experimental research on Machiavellianism, the expected relationships between Machiavellian orientations of principals and teacher-principal interactions were generally not found in the school setting. (Author)