Helen Elizabeth Roy, MBE, FRES (born 6 November 1969) is a British ecologist, entomologist, and academic, specialising in aphids and non-native species. Since 2007, she has been a principal scientist and ecologist at the NERC's Centre for Ecology & Hydrology. From 1997 to 2008, she taught at Anglia Ruskin University, rising to the rank of Reader in Ecology. She is the co-organiser of the UK Ladybird Survey, alongside Dr Peter Brown, is a visiting professor in the School of Biological Sciences, University of Reading and is a past President of the Royal Entomological Society.