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The aim of the present systematic review is to investigate the role of both classroom and school ethnic diversity, a structural aspect of interethnic relationships, in relation to bullying and victimization. Several moderators of this association have been analyzed: country or area of data collection, how ethnicity is operationalized and computed, and participants' school level. A systematic literature search on Scopus, Web of Science and Eric databases was conducted in January 2021; 4496 articles were identified and a final set of 20 papers have been selected. Almost half of the analyses did not find any significant association between bullying perpetration and ethnic diversity, while the other half found a positive one; few studies found a positive association between ethnic diversity and victimization. Operationalization of ethnicity and area of data collection play a role for both bullying perpetration and victimization. In North America, focusing on race, ethnic diversity has shown a protective role for victimization; in Europe, where the focus is on immigrant backgrounds, diversity may constitute a risk factor. About victimization, ethnic diversity represents a risk factor at younger ages and turns into a more protective factor in secondary schools. Results are discussed in terms of practical implications across development. • Ethnic diversity (ED) may affect rates of bullying and victimization. • In North America, focused on race, ED may be a protective factor for victimization. • In Europe, focused on immigrant background, ED may be a risk factor for bullying. • Developmental trends emerged, suggesting early interventions to promote inclusion. • Ethnic diversity at the school level is a protective factor for victimization. [ABSTRACT FROM AUTHOR]