This article introduces the Ethnic One-Sided Violence dataset (EOSV) that provides information on the ethnic identity of civilian victims of direct and deliberate killings by state and non-state actors from 1989 to 2013. The EOSV dataset disaggregates the civilian victims in the one-sided violence dataset from the Uppsala Conflict Data Program (UCDP) by identifying which ethnic group they belong to, using the list of politically relevant ethnic groups from the Ethnic Power Relations data (EPR). By providing information on the ethnic targets of violence, EOSV enables researchers to explore new questions about the logic and dynamics of violence against civilians.