Cyberbullying is a complex phenomenon, difficult to define and understand, and it has serious social and personal implications. Thus, a big effort is being made to progress along this emerging research line that is being very productive both at the national and international level. Nevertheless, given the complexity and fast evolution of information and communication technologies, there is a need to advance and further deepen in its study. Research in this field has been conducted mainly from the educational psychology branch, and its findings are the basis of the first psycho-educational interventions. In order to promote progress in this field and knowledge transfer to professional practice, this introductory paper describes briefly research on cyberbullying along with other related aspects to be explored, and introduces this international special issue on cyberbehavior and educational psychology. This special issue, published in this issue of Psicología Educativa [Educational Psychology], aims at contributing to the development of this emerging scientific field.