This study examines how mothers serving as board members or staff in social movement organizations negotiate and integrate mothering and activism, and how these two spheres interact. Based on semi-structured interviews, it found that activist mothers adopted strategies such as speeding up activist and domestic work, adjusting priorities situationally, practicing parenting within activist spaces, or separating the two roles. Activism and mothering mutually nourished one another, leading to the politicization of motherhood. Activist mothers demonstrated “activist mothering” in embracing nontraditional motherhood, including collective caregiving, political socialization of children, and renegotiations of intensive mothering. Furthermore, they reshaped activism by challenging masculine assumptions and arrangements and promoting care values in social movements. This research extended the concept of “activist mothering,” enriching feminist understandings of motherhood, and highlighted how mothering could actively shape activism, an underexplored dimension in studies on women and social movements.