John Charles White Halliday (19 June 1871 – 23 September 1946) was an Australian ophthalmologist who popularised intracapsular cataract extraction in Sydney.
Halliday was a member and Secretary of the College Literary and Debating Society, he served in the Cadet Corps and was a Prefect.
[4] In 1898 and 1899, Halliday studied ophthalmology in England before returning to Sydney and establishing a general practice at Rockdale, New South Wales.
He commenced special practice in Macquarie Street, Sydney in 1901 and was appointed as Clinical Assistant in Ophthalmology at Royal Prince Alfred Hospital (RPA).
Halliday was a member of the Ophthalmological Society of New South Wales and was pivotal in the establishment of the Optical Prescription Spectacle Makers in 1932 and the Medical Eye Service Clinic in 1934.