Latinx adolescents are overrepresented in the justice system and have high untreated behavioral health needs. We examined the family as well as promotive and inhibitive environments (i.e., neighborhood and school) and their associations on behavioral health among 181 first-time justice-involved Latinx adolescents. Results showed that more optimal caregiver-adolescent attachment was associated with fewer behavioral health needs; more negative caregiver-adolescent communication with greater behavioral health needs. Increased neighborhood disadvantage and negative school interactions served as inhibitive environments and were associated with greater behavioral health needs. Moderation analyses indicated that negative communication was associated with greater behavioral health needs among dyads with large acculturation differences but not for dyads close in acculturation. Findings underscore the need to assess the family relationships and communication, promotive/inhibitive environments, and acculturation differences when determining how to meet behavioral health needs among justiceinvolved Latinx adolescents.