People's mental image of a person who performs a behavior predicts their willingness to engage in that behavior. In particular, a negative mental image of an individual who seeks mental health services may be an important barrier to seeking help. Therefore, over the course of 5 studies, the authors developed and examined evidence for the reliability and validity of the Help-Seeker Stereotype Scale (HSSS), which is designed to measure the strength of respondents' endorsement of negative stereotypes (e.g., unstable, needy, incompetent) about people who seek help from a psychologist. Using independent samples of students and community members, exploratory and confirmatory analysis in Studies 1 (N ϭ 587), 2 (N ϭ 594), and 3 (N ϭ 353) revealed that the 12-item HSSS reflects a single common source of variance. In Study 4 (N ϭ 225), the HSSS total score was found to correlate in expected ways with 4 theoretically related constructs: mental illness stereotype endorsement (r ϭ .51), public stigma of seeking help (r ϭ .20), stereotype application/harm (r ϭ .37), and attitudes toward seeking professional psychological help (r ϭ Ϫ.25), providing convergent evidence of validity. Likewise, the HSSS total score accounted for unique variance (10%) in the self-stigma of seeking help beyond the variance accounted for by public stigma of seeking help (11%), providing initial incremental evidence of validity. Study 5 (N ϭ 150) found support for the HSSS' 4-week test-retest reliability (intercorrelation coefficient [2, k] ϭ .88).