Ivan de Burgh Daly CBE FRS FRSE (14 April 1893 – 8 February 1974) was a British experimental physiologist and animal physiologist who had a specialist knowledge of ECG use and was awarded a Beit Fellowship in this field in 1920. Together with Shellshear, he was the first in England to use thermionic valves in any biological context. In 1948, he was instrumental in the foundation of the Babraham Institute at the University of Cambridge. He was a leading authority on pulmonary and bronchial systems.