Background: Social cognitive deficits are prominent across several dimensions of psychopathology that compose a variety of psychiatric diagnoses. The hierarchical structure of the dimensions of psychopathology appears related to general cognitive ability (GCA). Yet, the exact relations among social cognition, GCA, and psychopathology dimensions remain unclear. Effective targeting of interventions toward social-cognitive deficits in psychopathology likely depends on improved understanding of these relations.Methods: Data were collected from three samples totaling 976 participants that included psychosis spectrum patients, their first-degree biological relatives, and individuals from community sources. Participants completed dimensional psychopathology measures and social cognition tasks (e.g., emotion perception and mentalizing). Using combined-sample analysis, we computed bi-factor exploratory structural equation models to estimate general and specific psychopathology factors, as well as their associations with social cognition and GCA.Results: Higher levels of general psychopathology, suspiciousness, and psychoticism (positive schizotypy) were associated with worse social cognition, but GCA statistically accounted for these associations. Two specific factors—detachment (negative schizotypy) and callous aggression—were associated with worse social cognition, independent of GCA. Interestingly, greater Machiavellianism and eccentricity were associated with better social cognition and GCA.Conclusion: Findings underscore social cognitive deficits as key features of psychopathology that span traditional categorical classifications and are specifically related to schizotypal and antagonistic psychopathology. Future research should further explore how dimensional, hierarchical models of psychopathology can be incorporated into social-cognitive interventions.