Unidentified serial killers

The Monster of Florence is the name coined by the Italian press for a serial killer active within the former province of Florence between 1968 and 1985. The Monster murdered sixteen victims, usually young couples secluded in search of privacy, in wooded areas during new moons. Although none of the murders were committed in the city of Florence proper, the name of the killer, initially referred to as the Maniac of Couples, was chosen due to the murders being committed in the surrounding countryside. After an investigation was launched in the early 1990s by the Florence Prosecutor's Office, several connected persons were convicted for involvement in the murders, yet the exact sequence of events, the identity of the main perpetrator and the motive remain unclear.

Murder of females in Ciudad Juárez, Mexico

gang of robbers and murderers

unidentified serial killer

1988–98 murders and disappearances of Iranian dissidents

unidentified serial killer in Namibia

Unidentified Belgian serial killer

unidentified serial killer

unidentified Colombian serial killer

The Stoneman is a name given by the popular English-language print media of Calcutta, India to an unidentified serial killer who murdered at least 13 sleeping homeless people in Calcutta in 1989. The name is also given to the perpetrator of a similar series of murders in Mumbai from 1983 to 1988. It has been speculated that these were the work of the same person, who could have been responsible for as many as 26 murders.