Isabelle Stengers (/ˈstɛŋərs/; French: [stɛn'ɡɛʁs]; born 1949) is a Belgian philosopher, noted for her work in the philosophy of science.

Trained as a chemist, she has collaborated with Russian-Belgian chemist Ilya Prigogine and French philosopher/sociologist Bruno Latour among others, and has written widely on the history of science as well as philosophers such as Gilles Deleuze, Alfred North Whitehead, Donna Haraway, and Michel Serres.

That writing operates, that words act, that stories, and the way they are told, matter, is always the case for Haraway – including when textual rhetoric aims at situating the reader in the position of having to follow an argumentation with no way around, to share a point of view presented as fundamentally anonymous.

[10] Stengers and Prigogine often draw from the work of Gilles Deleuze, treating him as an important philosophical source to think through questions regarding irreversibility and the universe as an open system.

Stengers' most recent work has turned to her proposition of Cosmopolitics, a key aspect of which Bruno Latour refers to as the "progressive composition of a common world" in which the non-human and the human are intimately entwined, and secondly, her revisiting and pragmatic modulation of the speculative philosophy of Alfred North Whitehead.