Thomas Gregor Brodie FRS FRSC (8 February 1866–20 August 1916) was a British physiologist.
He was educated at King's College School, St John's College, Cambridge and graduated in medicine from King's College London.
He was made a Fellow of the Royal Society in 1904 and delivered the Croonian Lecture in 1911. He was also a Fellow of the Royal Society of Chemistry and a Fellow of King's College London. He became Professor of Physiology at the University of Toronto in 1908.