Objective: Graduate students are more likely to experience mental illness than their peers in the general population. One potential source of support for personal issues and/or mental illness is a graduate student's faculty advisor. Although the relationship between faculty advisors and graduate students can positively influence the success and overall well-being of graduate students, graduate students may be reluctant to disclose mental health issues to their advisors. This study explores graduate students' perspectives on factors that influence their decision to disclose, or not to disclose, personal mental health information to their faculty advisor. Participants: The participants for this study were 28 graduate students from three universities in the southern United States. Methods: Four semi-structured focus groups were conducted over Zoom. Results: Thematic analysis of a series of focus groups with graduate students identified several consistent themes related to this disclosure decision-making process. Conclusions: Results have implications for mental health literacy and interpersonal communication interventions for those charged with mentoring graduate students.