Thomas Martin Barratt CBE FRCP (13 February 1936 – 17 January 2014) was a British paediatrician and professor of paediatric nephrology.

[2] Barratt's early schooling took place at Clifton College and after winning a scholarship to Trinity Hall, Cambridge, he graduated with a First-class honours in Natural Sciences.

After a number of house positions, he was appointed as a registrar at the Institute of Child Health, at Great Ormond Street Hospital, working with Professor Barbara Clayton.

[1] Barratt initially worked by himself, but was joined by Michael Dillon in 1975, and together they built a major world class paediatric nephrology services department at Great Ormond Street Hospital and conducted a research programme at the Institute of Child Health.

Barratt tested the drugs Azathioprine, Levamisole and cyclosporine A in subsequent trials, eventually working with paediatrician Michael Levin and others to study pathogenetic mechanisms involved in the syndrome, including e.g. Platelet-derived growth factor and prostacyclin inhibition.

In 1997 Barratt was appointed Commander of the Order of the British Empire (CBE) for services to children and awarded the prestigious James Spence Medal in 2002.