In this paper, I argue that critical posthumanism is a crucial tool in nursing philosophy and scholarship. Posthumanism entails a reconsideration of what ‘human’ is and a rejection of the whole tradition founding Western life in the 2500 years of our civilization as narrated in founding texts and embodied in governments, economic formations and everyday life. Through an overview of historical periods, texts and philosophy movements, I problematize humanism, showing how it centres white, heterosexual, able‐bodied Man at the top of (...) a hierarchy of beings, and runs counter to many current aspirations in nursing and other disciplines: decolonization, antiracism, anti‐sexism and Indigenous resurgence. In nursing, the term humanism is often used colloquially to mean kind and humane; yet philosophically, humanism denotes a Western philosophical tradition whose tenets underpin much of nursing scholarship. These underpinnings of Western humanism have increasingly become problematic, especially since the 1960s motivating nurse scholars to engage with antihumanist and, recently, posthumanist theory. However, even current antihumanist nursing arguments manifest deep embeddedness in humanistic methodologies. I show both the problematic underside of humanism and critical posthumanism's usefulness as a tool to fight injustice and examine the materiality of nursing practice. In doing so, I hope to persuade readers not to be afraid of understanding and employing this critical tool in nursing research and scholarship. (shrink)