The 11th edition of the International Classification of Diseases (ICD-11) is scheduled for approval by the World Health Assembly in May 2018. The chapter on mental disorders is currently under development. A draft of the clinical descriptions and diagnostic guidelines for all the disorders has been produced by the relevant Working Groups. A simplified version of the diagnostic guidelines for some disorders (i.e., schizophrenia and other primary psychotic disorders, mood disorders, anxiety disorders, disorders specifically associated with stress, and feeding and eating disorders) has been made available for use in the field studies of the classification. For all the other sections of the chapter on mental disorders, a brief general definition and sometimes a description of some of the included disorders can be found on the ICD-11 beta platform. In the present article, we summarize the content of the various sections of the classification on the basis of the available documents, with the warning that some of the elements of these sections may still be subject to revision.