Ira Thompson Van Gieson (1866, Long Island – March 24, 1913, New York City) was an American neurologist, psychiatrist, bacteriologist and neuropathologist.
Ira was born in Long Island in 1866, as the son of Dr. Ransford Everett Van Gieson (1836–1921).
In 1887, he served as a teacher at the college of physicians and surgeons and in 1894 he was appointed instructor of pathology and histology of the nervous system.
He was dismissed after five years because of political controversy involving the newly appointed president of the NY State Commission on Lunacy, Peter Wise.
He had a keen and incisive mind, he was alert and full of interest in everything, but he possessed that sensitive organization which made anything approaching control from outside sources utterly unsupportable.