David Thomas Delpy, (born 11 August 1948), is a British bioengineer, and Hamamatsu Professor of Medical Photonics, at University College London. Delpy was educated at Heaton Grammar School in Newcastle. He went on to study at Brunel University, graduating with a first class Bachelor of Science degree in Applied Physics. He was awarded a Doctor of Science degree by University College London in Medical physics. Delpy served as Chief Executive of the Engineering and Physical Sciences Research Council. As of 2014, he is chairman of the Defence Scientific Advisory Council and a member of the strategic advisory board of the EPSRC's quantum technologies programme. Delpy was appointed CBE in the 2014 Birthday Honours for services to engineering and scientific research. He was elected a Fellow of the Royal Society (FRS) in 1999. He was also elected a Fellow of the Royal Academy of Engineering in 2002. In 2008 he was awarded the Institute of Physics Rosalind Franklin Medal and Prize.