This article examines the United Nations Security Council resolutions on women, peace and security (WPS) and argues for an expansion of existing agendas to incorporate security away from the repetition of militarized security, extractive capital, and Western humanism through attention to maritime security. Drawing on posthuman feminisms, critical ocean studies, and decolonial and queer feminist engagements with the ocean, I propose the identification of the ocean as a legal subject to enact an unmooring of the ways in which gendered security is currently thought about, realized, and deployed in legal spaces. The liberal feminist preoccupation with including women and creating gender parity, the radical feminist legal agenda for addressing sexual violence, and the cultural feminist legal reforms that center women’s differences are challenged as reasserting and reifying the status quo of law and legal arrangements. Feminist maritime security, posthuman, with the ocean as subject, contributes ways to think and know law in new registers and addresses the legacy of humanist exclusions of both human and nonhuman subjects. Furthermore, oceanic subjectivity invites reflection on the necessity of terraqueous thinking for planetary survival.