Many people, including genetic counselors (GCs), have been found to hold stigmatizing attitudes towards people with mental illnesses. We aimed to determine whether these attitudes could be changed by exposing GCs/GC students to a documentary film about people with mental illness. We screened the documentary at the 2010 North American conferences for GCs. Immediately before (T1), immediately after (T2), and one month after (T3) watching the documentary, participants self-rated their comfort with asking patients about mental illness, and completed scales measuring two aspects of stigma: stereotype endorsement (SE) and desire for social distance (SD). A total of 87 T1 and T2 questionnaires, and 39 T3 questionnaires were returned. At T2 and T3, 34.5% and 48.7% respectively reported feeling more comfortable to ask patients about mental illness. Scores on SD and SE scales decreased significantly from T1 to T2, but returned to initial levels at T3. The documentary increased GC/GC students' comfort with asking about mental illness and temporarily decreased stigmatizing attitudes.