Social scientists have made contradictory claims about the impact of ethnicity on social cohesion, the levels of social trust, civic and political engagement. This paper conceptualizes ethnic diversity as a contextual variable and evaluates its effect on the electoral participation of the Hungarian minority from Romania, using a case study of the Romanian Parliamentary Elections of 2008. The article examines the differences in turnout between Hungarian electors living in different counties of Romania, and how this varies by the ethnic composition of the counties. We discern two patterns of electoral participation of the Hungarian minority: lower turnout in ethnically non-competitive counties (i.e. low ethnical diversity, with the size of Hu...