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Social movements are not distinct and self-contained; rather, they grow from and give birth to other movements, work in coalition with other movements, and influence each other indirectly through their effects on the larger cultural and political environment. Building on both political process and collective identity perspectives, this paper uses a case study of the women's movement's impact on U.S. peace movement activity in the 1980s to develop a theory of movement-movement influence. We argue that this influence is shown by: 1) the adoption of feminist ideological frames by the peace movement; 2) the spread of the women's movement's tactical innovations into peace protest; 3) increased presence of women in leadership positions in both the institutionally-oriented and direct action wings of the movement; and 4) the adoption of organizational structures that built on feminist processes designed to avoid hierarchy. Drawing data from both movements at local and national levels, we suggest four mechanisms of transmission between the movements: 1) organizational coalitions; 2) overlapping social movement communities; 3) shared personnel; and 4) broader changes in the external environment. Social movement spillover effects have implications for our understanding of both the continuity and impact of social protest movements.