Abstract This article explores the complex relationship between the network of actors in the United States and Ireland who sought to influence American foreign policy in the Northern Ireland peace process. These networks operated in civil society, representing numerous Irish American organizations linking corporate and church leaders and the media to members of the Irish American diaspora in government to influence the United States’ diplomacy. These Irish American groups and individuals interested in influencing events in Northern Ireland were linked with a wide array of governmental and non-governmental actors in Ireland. Often, Americans were quite deferential to leaders and groups in Ireland and Northern Ireland who sought to mobilize the Irish diaspora in the United States for their cause. Thus, the United States’ role in Ireland and Northern Ireland was not that of a hegemonic power but one of an empathetic actor responding to developments and cues provided by various actors in the Irish context. Transatlantic networking, made more possible due to technological changes in communication and transportation, facilitated increased exchanges of ideas, agents, and information. These networks allowed groups across the Atlantic to elicit support for local groups in Northern Ireland and mobilize the US government to play a political and diplomatic role in the conflict and peace process. Ultimately, the majority of Irish Americans moved from supporting the nationalist/republican side in the early years of the Troubles to becoming strong supporters of the peace process in the 1990s.