The present booklet is about gender-responsive substance abuse treatment services for women. It is part of the United Nations Office on Drugs and Crime (UNODC) project to develop tools to support the development and improvement of substance abuse treatment services, based on evidence from the literature and case studies that illustrate practical experiences and lessons learned in providing substance abuse treatment services in various regions of the world. Other publications in this Drug Abuse Treatment Toolkit series are: Investing in Drug Abuse Treatment: a Discussion Paper for Policy Makers; Contemporary Drug Abuse Treatment: a Review of the Evidence Base; and Drug Abuse Treatment and Rehabilitation: a Practical Planning and Implementation Guide.* These can be found on the UNODC web site (www.unodc.org/unodc/en/treatment_toolkit.html).