Ivan Pului (son of Pavlo Pului Ukrainian: Іва́н Пулю́й, син Павла́ Пулю́я; German: Johann Puluj; 2 February 1845 – 31 January 1918) was a Ukrainian physicist and inventor, who has been championed as an early developer of the use of X-rays for medical imaging. His contributions were largely neglected until the end of the 20th century.