Counselors are required to have high levels of social-cognitive development, significant knowledge regarding ethical and legal practice, and sound ethical decision-making processes to provide effective and ethical services to their clients. This study investigated the effect of two counseling ethics courses on 64 master's-level counselor education students' levels of social-cognitive development, ethical and legal knowledge, and ethical decision making. Students' ethical and legal knowledge scores increased significantly, and precourse social-cognitive maturity predicted postcourse ethical and legal knowledge scores. Implications for counselor education and development are discussed.