ABSTRACTDiasporas have played important roles in democratization in their homelands. But how does diaspora mobilization occur when the country of settlement has a small and isolated ethnic community, the host and homeland governments have weak relations, and the conflict is invisible in the geographies of power? Using case study research, I analyse how solidarity groups in the Netherlands facilitated the emergence and growth of diaspora mobilization for democracy in the Philippines during the dictatorship of Ferdinand Marcos. My findings show that in cases where exiles and migrants lack pre-existing economic, political and social ties in the host society, solidarity groups can affect the political opportunity structure in the host country, permitting the promotion of certain claims and demands in the public sphere. Furthermore, diaspora mobilization can develop within the formal organizations or associational networks of solidarity groups.