Constantin Ion Parhon (Romanian pronunciation: [konstanˈtin iˈon parˈhon]; 15 October 1874 – 9 August 1969) was a Romanian neuropsychiatrist, endocrinologist and politician. He was the first head of state of Communist Romania from 1947 to 1952. Parhon was President of the Physicians and Naturalists Society in Iași, hospital director, professor, and director of medical institutes.