We examined the association of callous-unemotional (C/U) traits with length of psychiatric hospitalization among two samples each with 50 participants: a group of 7-11 year-olds (39 males and 11 females) receiving services on a children's unit, and a group of 12-17 year-olds (27 males and 23 females) receiving services on an adolescent unit. Our analyses focused on the additionally predictive value of C/U traits above and beyond the influence of pre-established risk factors for length of stay, including age, gender, ethnicity, overall levels of functioning and psychopathology, and the diagnosis of a Conduct Disorder or Oppositional Defiant Disorder. In both samples, hierarchic regression analyses indicated that C/U traits were associated with longer lengths of stay, whereas none of the previously identified risk factors were significant. The discussion of these results focuses on the importance of developing non-coercive and non-confrontational therapeutic treatment regimens for youth with C/U traits receiving inpatient psychiatric services.