Committee for Integrated HPS Session. Philosophers of science and of history have long been engaged with shared matters: debating the differences between historical explanation and scientific explanation, understanding the sources of scientists' claims to knowledge, and investigating the development of valid scientific methods. This session is concerned with integrating our treatments of narratives in science. We tell historical or H-narratives about the science/scientists we study, but we also refer to the narratives that the scientists tell themselves while they are working, including narratives they recount about phenomena in their fields. Philosophers may analyse scientists' narratives in philosophical terms (P-narratives) and develop our own narrative accounts of scientific 'progress' or change. This session aims to open up for analysis the relationship between H- and P- narratives in integrated history and philosophy of science. It does so primarily by focussing on the nature of 'research narratives' (the narratives that scientists tell formally or informally about their own research work) and their 'narratives of nature' (the narratives they tell of what happens in the phenomena they are investigating). This useful distinction drawn and labelled by Robert Meunier (2022) offers multiple possibilities for integrating philosophical and historical accounts in our own narratives about those sciences/scientists.