Ormerod died of liver disease at Torrington House, St Albans, Hertfordshire, on 19 July 1901, and was buried in St Albans.
Eleanor Anne Ormerod died on 19 July 1901 at Torrington House, her home in St Albans, Hertfordshire, England, succumbing to malignant disease of the liver. She was 73 years old at the time of her death, having spent more than three decades as Britain's foremost authority on economic entomology.
Her death marked the end of a career that had transformed agricultural science in Britain. Ormerod had continued corresponding with farmers, revising her pest-control recommendations, and maintaining her extensive network of scientific contacts almost until the end of her life. She was buried in St Albans, the town where she had spent much of her later career conducting research and answering the thousands of letters she received annually from farmers seeking her expert advice.
Following her death, Ormerod's legacy was honored through numerous tributes, including the establishment of the Ormerod Lectureship in Economic Entomology at the University of Edinburgh, funded by a bequest she left in her will along with her library and insect collections. Her autobiography, compiled and edited posthumously by Robert Wallace, was published shortly after her death, ensuring her pioneering contributions to entomology and her extraordinary rise from amateur observer to internationally respected expert would be documented for future generations of scientists, both male and female.