How common is mental illness among applied psychologists? This question is paradoxically neglected, perhaps because disclosure and discussion of lived mental health difficulties remains taboo within the field. This study documented high rates of current and lifetime mental health difficulties and diagnoses (MHDD) among faculty, graduate students, and others affiliated with accredited doctoral and internship programs in clinical, counseling, and school psychology. Over 80% of respondents (N = 1,395 of 1,692) reported lifetime mental health difficulties, and nearly half reported a formal mental health diagnosis. The most commonly reported lifetime MHDD were depression (over 55%), generalized anxiety disorder (over 50%), and suicidal thoughts or behaviors (over 40%), while bipolar (< 2%) and psychotic disorders (< 1%) were among the least reported. Most respondents with MHDD (90%) reported mild or no impairment in professional domains due to MHDD. Graduate students were more likely to endorse MHDD than faculty and were more likely to report professional impairment. Overall, lifetime rates of psychopathology within clinical, counseling, and school psychology faculty and trainees were similar to or greater than those observed in the general population. We discuss the implications of these results and suggest specific directions for future research on this heretofore neglected topic.