Workplace cyberbullying, defined as negative, technology-mediated behaviors that are repetitively experienced by a vulnerable target within the work context, is a relatively new topic within the workplace aggression literature. This chapter begins with an exploration of the prevalence of workplace cyberbullying and finds that about 3–20% of workers have been repeatedly targeted with cyberbullying behaviors. Next, research on the correlates, mediators, and moderators of workplace cyberbullying is summarized, with a focus on person-related and work-related variables such as mental health, physical health, perceptions of the job (e.g., job satisfaction), job-related behaviors (e.g., intentions to quit), and coping strategies. Then, recently validated measures of workplace cyberbullying are described, providing researchers with guidance on questionnaires to use in future studies of workplace cyberbullying. The chapter concludes with a discussion of future research directions and practical applications, with an eye toward the development and evaluation of effective workplace cyberbullying interventions.