Many diversity courses in psychology originally aimed to reduce student racial bias and raise their awareness of racism. However, quantitative data testing the effectiveness of such courses are lacking. This study assessed a required diversity course's effectiveness in raising awareness of White privilege and racism; increasing support for affirmative action; and reducing prejudice, guilt, and fear of other races. Students (N = 146) completed identical surveys during the first and last weeks of the semester. Results indicated greater awareness of White privilege and racism and more support for affirmative action by the end of the term. White students (n = 131) also expressed greater White guilt after completing the course. (Contains 3 tables.)