John Robin Warren AC (11 June 1937 – 23 July 2024) was an Australian pathologist, Nobel laureate, and researcher who is credited with the 1979 re-discovery of the bacterium Helicobacter pylori, together with Barry Marshall.

Warren trained at the Royal Adelaide Hospital and became a Registrar in Clinical Pathology at the Institute of Medical and Veterinary Science (IMVS).

At the University of Western Australia,Warren along with his colleague Barry J. Marshall, proved that the bacterium is the infectious cause of stomach ulcers.

[3] Warren helped develop a convenient diagnostic test (14C-urea breath-test) for detecting H. pylori in ulcer patients.

[5] Asteroid 254863 Robinwarren, discovered by Italian amateur astronomer Silvano Casulli in 2005, was named in his honour.