Claims about the entanglement of humans and non-humans have gained increasing popularity in the social sciences and the humanities recently. Those perspectives, however, have so far gained hardly any foothold within relational sociology, resulting, therefore, in an all-too-narrow, anthropocentric understanding of relations. The chapter proposes that posthuman feminist scholarship offers valuable tools to broaden the concept of relationality and to reconsider humans as embodied beings in a more-than-human world. It aims to bring relational sociology and posthuman feminist perspectives into a fruitful dialogue, discussing what relational sociology might learn from posthuman feminism, and how also posthuman feminism could strengthen some of its theoretical premises through engaging with core ideas of relational sociology. The chapter also elaborates on what it means to do more-than-human relational sociology by using the living relations that humans have with waste and biotechnologies related to reproduction and ageing as two illustrative examples.