Professor Louise Heathwaite, CBE FRSE FRSB is a British environmental scientist. She is Distinguished Professor in the Lancaster Environment Centre at Lancaster University and Pro-Vice-Chancellor of Research and Enterprise. She is a hydrochemist working on diffuse environmental pollution, especially the pathways of nitrogen and phosphorus loss from agricultural land to water. In 2015, she was elected a Fellow of the Royal Society of Edinburgh in recognition of the distinguished contribution she has made to catchment science and to science-policy engagement.