Women offenders with substance abuse problems typically have many treatment needs on reentry to the community from prison. This paper explores the correlates of treatment needs among a sample of women offenders with substance-abuse problems (n = 1,404), and the relationship between their treatment needs and other background characteristics with completion of community-based treatment after parole. Treatment needs were assessed at admission into prison-based substance abuse treatment; participants were admitted into community-based treatment upon parole. Descriptive statistics and multiple regression were used to examine their treatment needs; logistic regression analysis was used to determine the factors related to completion of the aftercare program. Analysis of variance was used to examine ethnic differences in treatment needs. Greater treatment needs were associated with unstable housing before incarceration, a history of sexual or physical abuse, mental health problems, alcohol or drug dependence, and first arrest at age <19; lower treatment needs were associated with having been mandated to prison-based treatment (versus volunteering). Mental health problems and earlier age at first arrest predicted treatment noncompletion. Drug dependence was associated with higher treatment needs and a greater likelihood of treatment completion, whereas African American and Hispanic ethnicity were both associated with lower treatment needs (compared with Whites) and a lower likelihood of treatment completion. Interventions are needed to engage substance-abusing women offenders in community treatment after parole to address their treatment needs, improve their retention in treatment, and reduce the likelihood of recidivism.