[Correction Notice: An Erratum for this article was reported online in Personality Disorders: Theory, Research, and Treatment on Oct 26 2023 (see record 2024-19662-001). In the original article, the authors changed the order of authorship from "Blair D. Batky, Allison N. Shields, Jennifer L. Tackett, and Randall T. Salekin" to "Blair D. Batky, Allison N. Shields, Randall T. Salekin, and Jennifer L. Tackett." All versions of this article have been corrected. The names appear correctly in this record.] Callous-unemotional (CU) traits (i.e., tendencies to experience low levels of guilt and empathy) are associated with severe and persistent conduct problems in youth. However, some youth with elevated CU traits do not exhibit severe externalizing problems, and further research is needed to identify conditions under which CU traits are more versus less strongly associated with higher levels of externalizing behavior. To this end, the current preregistered study examined whether internalizing problems, five-factor model personality traits, and parenting practices moderated associations between CU traits and externalizing problems. Caregivers of 1,232 youth ages 6-18 (Mage = 11.46) reported on youths' CU traits, externalizing, internalizing, and five-factor model traits as well as on their own parenting practices. We found that the relationship between CU traits and externalizing was robust to the moderating effects of internalizing problems and parenting practices, but CU traits were more strongly related to externalizing problems at higher levels of neuroticism and at lower levels of agreeableness and conscientiousness. Results contribute to a more comprehensive understanding of externalizing problems among youth high in CU traits and may inform future longitudinal and intervention research seeking to identify factors that reduce externalizing behavior among high-CU youth. (PsycInfo Database Record (c) 2024 APA, all rights reserved).