In June 2015, the Center for Reproductive Rights partnered with SisterSong Women of Color Reproductive Justice Collective to host Black Mamas Matter, a cross-sector convening of leaders on Black maternal health. Researchers, service providers, policy experts, and community organizers gathered at the SisterSong Mother House in Atlanta, Georgia, to identify innovative strategies for improving Black maternal health outcomes. Among the many ideas generated on that day, participants identified a need for advocacy tools that would move the conversation one step closer to a rights-based maternal health policy agenda. This toolkit is a direct response to that call, and includes materials that will support the work of state maternal health advocates as they mobilize their communities and communicate with state policy leaders.