Spanish is the second most widely spoken native language in the world, and an official language in 21 countries (not including the USA, the country with the second-largest population of Spanish speakers after Mexico). The World Health Organization (WHO) Collaborating Centre for Research and Training in Mental Health Services in the Department of Psychiatry at the Universidad Autónoma in Madrid, Spain has been integrally involved in the development, testing and dissemination of the ICD-11 CDDR for more than 15 years. Translation of the CDDR into Spanish has long been a part of the Centre's WHO work plan. The development of the CDDR included a comprehensive programme of field testing to assess its reliability, clinical utility and global applicability. This included more than a dozen internet-based studies in different diagnostic areas comparing the ICD-11 diagnostic guidelines with the ICD-10. Participants were members of the Global Clinical Practice Network, comprising 20,000 clinicians from more than 160 countries. Clinic-based studies with real patients were also conducted in 14 countries, including Spain and Mexico and other countries from every WHO global region. In collaboration with the Instituto Nacional de Psiquiatría in Mexico, our Collaborating Center ensured that Spanish was among the languages in which every single ICD-11 field studies was conducted. As a result, a substantial portion of the material in the CDDR had already been translated into Spanish, but needed to be reconciled with the final WHO version. The Spanish version of the CDDR will be published prior to the ICAP Congress, with the Universidad Autónoma de Madrid as the publisher and an agreement for printing and dissemination with a commercial publisher. This presentation will focus on the international development of the Spanish CDDR, as well a range of issues related to its translation and dissemination.