Two studies examined college students' perceptions of professors' ethical responsibilities. Students agreed that professors must demonstrate respect for students, teach objectively, and grade honestly, and they should not tolerate cheating or plagiarism. Results indicate that students expect professors to act with professionalism, to employ a vast base of content knowledge, and to show concern for student welfare. Many view professors as exemplars of scholarship and professional behavior. Professors must be cognizant of student expectations and should reflect on their behavior both in and out of the classroom. (Contains 3 tables.)