Marking the 25th anniversary of the Good Friday Agreement, we review the gendered legacy of power-sharing and peacebuilding in Northern Ireland. The participation of an all-women’s political party in the 1996–1998 peace talks and world-class commitments to human rights and equality enshrined in the Good Friday Agreement suggested that Northern Ireland would stand as a conflict resolution and institutional design model par excellence. While the intervening years have been largely peaceful, and women’s political representation has improved, years of political stalemate and poor equality and human rights protections for women suggest a mixed legacy of gender inclusion and power-sharing. In this paper, we chart the ups and downs of Northern Ireland’s power-sharing institutions in the context of feminist peace activism over two and a half decades and offer a set of feminist reflections on the promise and peril of power-sharing in Northern Ireland.