Vincenzo Tiberio (May 1, 1869 – January 7, 1915) was an Italian researcher and medical officer of the Medical Corps of the Italian Navy and physician at the University of Naples. Observing that people complained of intestinal disorders after the walls of a well which supplied drinking water was cleaned off, he published a little noticed 1895 paper on the bactericidal effect of some molds, 35 years before Alexander Fleming's discovery of penicillin.