PurposeClinician turnover in mental health settings impacts service quality, including availability and delivery of evidence-based practices. Leadership is associated with organizational climate, team functioning and clinician turnover intentions (TI). This study examines leader–member exchange (LMX), reflecting the relationship between a supervisor and each supervisee, using mean team LMX, dispersion of individual clinician ratings compared to team members (i.e. relative LMX) and team level variability (i.e. LMX differentiation), in relation to organizational climate and clinician TI.Design/methodology/approachSurvey data were collected from 363 clinicians, nested in children's mental health agency workgroups, providing county-contracted outpatient services to youth and families. A moderated mediation path analysis examined cross-level associations of leader–member exchange with organizational climate and turnover intentions.FindingsLower relative LMX and greater LMX differentiation were associated with higher clinician TI. Higher team-level demoralizing climate also predicted higher TI. These findings indicate that poorer LMX and more variability in LMX at the team level are related to clinician TI.Originality/valueThis study describes both team- and clinician-level factors on clinician TI. Few studies have examined LMX in mental health, and fewer still have examined relative LMX and LMX differentiation associations with organizational climate and TI. These findings highlight the importance of leader–follower relationships and organizational climate and their associations with clinician TIs. Mental health service systems and organizations can address these issues through fostering more positive supervisor–supervisee relationships.