John William Henry Eyre (18 July 1869 – 17 February 1944) was a British bacteriologist and ophthalmologist, specialising in the bacteriology of the eye.

In 1889 he entered Guy’s Hospital Medical School which linked to a Diploma at the University of Durham graduating MB in 1893, followed by a course in Public Health at Cambridge University.

His proposers were Robert Howden, Sir Thomas Oliver, Angus MacGillivray, and Sir German Sims Woodhead[2] In 1899 he moved to Charing Cross Hospital and in 1900 became the first recipient of the Ernest Hart Memorial Research Scholarship.

In 1906 he spent the summer in Malta having been co-opted onto the Royal Society Commission on Mediterranean Fever.

From 1920 to 1934 he was Professor of Bacteriology at the University of London (attached to Guy's Hospital).