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Aim: Low self‐esteem (LSE) has been reported among individuals with psychosis and is hypothesized to act as a risk and maintenance factor for the disorder. However, the extent to which LSE also characterizes individuals deemed at ultra‐high risk (UHR) for psychosis (who present features consistent with the prodromal phase of illness), has yet to be quantified using meta‐analysis. This is important given that LSE is a potentially modifiable target for early intervention services aiming to reduce the risk of psychosis transition in this population. Methods: We searched Medline, Embase, PsycINFO and Web of Science Core Collection for studies examining self‐esteem in UHR and healthy individuals. Random‐effects models were used to examine group differences in self‐esteem (Hedges'g) with exploratory meta‐regression analyses employed to investigate the effect of study characteristics (mean age of UHR group, the proportion of male participants in the UHR group and study quality) on standardized mean differences. Results: Six studies were eligible for inclusion. Significant differences in self‐esteem were observed, with individuals at UHR showing reduced self‐esteem relative to healthy controls (g = −1.33 [−1.73 to −0.94] P <.001).However, there was evidence of substantial heterogeneity (I2 = 75%). Exploratory meta‐regression analyses indicated a significant effect of the mean age of the UHR group on effect sizes (B = −0.26, P =.02). Conclusions: UHR youth present with lower levels of self‐esteem than healthy individuals, a difference that appears to be more pronounced with advancing age. We discuss clinical implications and provide recommendations for future studies. [ABSTRACT FROM AUTHOR]