The principal-school counselor relationship and school climate were explored with 279 high school principals in this quantitative study. Pearson's correlations revealed the principal-counselor relationship was significantly positively correlated with three dimensions of school climate: collegial leadership, professional teacher behavior, and achievement press. In addition, three elements of the principal-counselor relationship (mutual trust between the principal and school counselors, a shared vision of what is meant by student success, and mutual respect between the principal and school counselors) were significantly negatively correlated with institutional vulnerability, the fourth dimension of school climate. We discuss implications for principals, school counselors, and others.