Mikhail Yuryevich Malyshev (Russian: Михаил Юрьевич Малышев; 31 October 1965 – 19 December 2025), known as the Perm Cannibal (Russian: Пермский людоед), was a Russian murderer, cannibal and possible serial killer who was convicted of murdering, dismembering and eating the remains of two acquaintances in the city of Perm between 1997 and 1998. He was also suspected of six similar murders for which he was never charged.

Robert Charles Browne (born October 31, 1952) is an American murderer who is currently serving two life sentences for the murders of two teenage girls in Colorado Springs, Colorado, committed in 1987 and 1991, respectively. A few years into his sentence, he sent letters to the El Paso County Sheriff's Office in which he claimed to be a serial killer who has killed approximately 48 or 49 people since 1970 across several states.

Cayetano Santos Godino (31 October 1896 – 15 November 1944), also known as El Petiso Orejudo (Spanish: The Big-Eared Midget), was an Argentine serial killer and arsonist who murdered four children, attempted to kill seven others, and set fire to seven buildings, psychologically enjoying fires.

Martin Lecián (31 October 1900 – 6 October 1927) was a Czech serial killer who murdered 3 policemen and a prison officer and attempted to kill 7 other policemen. He was executed on 6 October 1927.

Mary Ann Cotton (née Robson; 31 October 1832 – 24 March 1873) was an English convicted murderer who was executed for poisoning her stepson. Despite her sole conviction for murder, she is believed to have been a serial killer who killed many others including 11 of her 13 children and three of her four husbands for their life insurance policies.