The Monster of Florence is an epithet commonly used for the perpetrator, or perpetrators, of 16 murders, nearly all of couples, that took place between 1968 and 1985 in the province of Florence, Italy.

Four local men -- Stefano Mele, Pietro Pacciani, Mario Vanni, and Giancarlo Lotti -- were arrested, charged, and convicted of the crime at different times. However, these convictions have been criticized and ridiculed in the media; critics suggest that the real killer or killers have never been identified. Several other suspects were arrested and held in captivity at various times, but they were later released when subsequent murders using the same weapon and methods cast doubt on the guilt of the suspects held in captivity.