Daya Kishore Hazra is an Indian medical doctor, known for his expertise in nuclear medicine and endocrinology. The Government of India honoured him, in 2014, with the award of Padma Shri, the fourth highest civilian award, for his contributions to the fields of medicine. He was born in Uttar Pradesh, India and graduated in medicine from Sarojini Naidu Medical College, Agra. Dr. Hazra, considered by many as a pioneer of nuclear medicine in India, is best known for his contributions to radioimmunoassays and enzyme-linked immunosorbent assays. He is credited with pioneering contributions in the monitoring of hypothyroidism and in the analysis of triiodothyronine and Thyroid-stimulating hormone TSH hormones. He is reported to have developed T3 and TSH hormmone tests and the technique to contain cancerous cells using isotopes, deploying a therapeutic protocol called radio-bioconjugate therapy. Reports confirm that these achievements assisted him to be shortlisted for the Nobel Prize for Physiology in 1977. Dr. Hazra, the President of the Nuclear Medicine Society, also serves as the editorial board member of Diabetes India and is the life patron of Nimitt Matra Charitable Society.