Uwe Böhnhardt (1 October 1977, in Jena – 4 November 2011, in Eisenach) was a German right-wing extremist who was one of three core members of National Socialist Underground (NSU), a neo-Nazi terror group that included scores of associates providing logistical support to the core trio. The other two core members were Uwe Mundlos and Beate Zschäpe.

Bertha Alice Williams Graham Gifford (October 30, 1871 – August 20, 1951) was a farmwife in rural Catawissa, Missouri during the early 1900s who was accused of murdering three members of the local community and suspected in 15 additional deaths. Some consider her to be America's fifth solo female serial killer, behind Belle Gunness, Lydia Sherman, Jane Toppan, and Nannie Doss.

Eve Frank or Eva Frank (1754 – 1816 or 1817) born Rachel Frank in Nikopol, Ottoman Empire (now Bulgaria), was a mystic cult leader, and the only woman to have been declared a Jewish messiah according to historian Jerry Rabow. She was the daughter of Jacob Frank.

Amy Duggan "Sister" Archer-Gilligan (October 31, 1873 – April 23, 1962) was a nursing home proprietor and serial killer from Windsor, Connecticut. She murdered at least five people by poisoning them.

Carmine Paul "Mr. Gribbs" Tramunti (October 1, 1910 – October 15, 1978) was an Italian-born American mobster who was the boss of the Lucchese crime family.

Thomas Griffiths Wainewright (October 1794 – 17 August 1847) was an English artist, author and suspected serial killer. He gained a reputation as a profligate and a dandy, and in 1837, was transported to the penal colony of Van Diemen's Land (now the Australian state of Tasmania) for frauds on the Bank of England.

Gianfranco Stevanin (born 2 October 1960), known as The Monster of Terrazzo, is an Italian criminal and serial killer, convicted of murdering six women between 1993 and 1994. His case had great prominence in the national media and raised a debate on the question of the incapability of criminals to understand the consequences of their acts.

Frederick Mors (born Carl Menarik, 2 October 1889 – 1918?) was an Austrian serial killer. Mors killed eight elderly patients by poison while employed in a nursing home in New York City.

Ernst-Dieter Beck (2 October 1940 – 29 April 2018) was a German serial killer. He was the first person accused of murder in German legal history on whom a chromosome test was applied.

Jonathan Preston Haynes (born 10 March 1958) is an American murderer known for racially motivated murders.

Beverly Gail Allitt (born 4 October 1968) is an English serial killer who was convicted of murdering three infants and an 11-year-old boy, and attempting to murder three others, and causing grievous bodily harm to a further six at Grantham and Kesteven Hospital, Lincolnshire, between February and April 1991. She committed the murders as a State Enrolled Nurse on the hospital's children's ward.

Peter Bryan (born 4 October 1969) is a British serial killer with schizophrenia who committed three murders between 1993 and 2004.

John Ellis (4 October 1874 – 20 September 1932) was a British executioner for 23 years, from 1901 to 1924. His other occupations were as a Rochdale hairdresser and newsagent.

Francisco Félix de Souza (5 October 1754 – 8 May 1849) was a Brazilian slave trader who was deeply influential in the regional politics of pre-colonial West Africa (now Benin, Togo and Nigeria). He founded Afro-Brazilian communities in areas that are now part of those countries and went on to become the "chachá" of Ouidah (the slave-trading hub for the region), a title that conferred no official powers but commanded local respect in the Kingdom of Dahomey, where, after being jailed by King Adandozan of Dahomey, he helped Ghezo ascend the throne in a coup d'état.

Marion Albert Pruett (October 4, 1949 – April 12, 1999) was an American serial killer.

Beate Schmidt (born Wolfgang Schmidt; 5 October 1966) is a German serial killer and rapist, who killed six people and injured four between 1989 and 1991 in various villages in Brandenburg.

Karl Hass (5 October 1912 – 21 April 2004) was an SS Sturmbannführer and German spy who helped deport more than 1,000 Italian Jews to Auschwitz. A perpetrator in the Ardeatine massacre, in which 335 civilians were murdered, he was tried and convicted in Italy in 1998.

Jean-Baptiste Troppmann (October 5, 1849 – January 19, 1870) was a French spree killer who between August 24 and September 19, 1869, murdered eight members of the Kinck family, including six children aged between 2 and 16 years old, in order to gain access to their money. He was caught at the port of Le Havre at the end of September 1869 while attempting to flee the country.

Angelo Anthony Buono Jr. (October 5, 1934 – September 21, 2002) was an American serial killer, kidnapper and rapist who, together with his adopted cousin Kenneth Bianchi, raped and murdered ten young women and girls between October 1977 and February 1978 in Los Angeles, California in what became known as the Hillside Strangler murders, as the victims were usually strangled to death and dumped on a hillside.

Gilberto Antonio Chamba Jaramillo (born 1963) is an Ecuadorian serial killer, convicted of murdering nine people in Ecuador and Spain.

Fritz Ernst Fischer (5 October 1912 – 2003) was a Nazi German medical doctor who performed medical atrocities on inmates of the Ravensbrück concentration camp. He was tried and convicted of war crimes and crimes against humanity in the 1947 Doctors' Trial; he was sentenced to life imprisonment, but his sentence was commuted to 15 years and he was released in 1954.

Klaas Bruinsma (6 October 1953 – 27 June 1991) was a Dutch drug lord. He was shot dead on 27 June 1991 by organized crime member and former police officer Martin Hoogland.

Nikolay Suleimanov (Russian: Николай Сулейманов; 6 October 1955 – December 1994) nicknamed "Khoza" and "Ruslan", was a Chechen mafia leader active in the 1980s and 1990s.

Jeanne Weber (7 October 1874 – 5 July 1918) was a French serial killer. She strangled at least 10 children, including her own.

Gary Charles Evans (October 7, 1954 – August 14, 1998) was an American thief and confessed serial killer in and around the Capital District, New York. His penchant for stealing antiques and his multiple escapes from custody — including one that ended in his death — made him headline news in the area on numerous occasions.

Daniel Marino (born October 7, 1940) is an Italian American mobster and member of the Gambino crime family. He was identified as a member of the family's leadership panel, alongside John Gambino and Bartolomeo Vernace, in 2009.

Juan Antonio Arreola-Murillo (born October 7, 1980), also known as the February 9 Killer, is a murderer responsible for the killing of two Salt Lake County, Utah women across the span of two years. In 2006, Arreola-Murillo murdered Sonia Mejia and her unborn baby.

Irma Ilse Ida Grese (7 October 1923 – 13 December 1945) was a Nazi concentration camp guard at Ravensbrück, Auschwitz II-Birkenau, and Bergen-Belsen. She has been widely known as the "Hyena of Auschwitz" and the "Beast of Belsen" for the atrocities she committed in Birkenau.

Heinrich Luitpold Himmler (German: [ˈhaɪnʁɪç ˈluːɪtpɔlt ˈhɪmlɐ] ; 7 October 1900 – 23 May 1945) was a German Nazi politician and military leader. He was the 4th Reichsführer of the Schutzstaffel (Protection Squadron; SS) from 1929 to 1945.

Helmut Kallmeyer (8 October 1910 – 27 September 2006) was a German chemist in the era of National Socialism. He served as a consultant in Adolf Hitler's Chancellery (Kanzlei des Führers) for gasification methods.

Between 2010 and 2017, a total of eight men disappeared from the neighbourhood of Church and Wellesley, the LGBTQ village of Toronto, Ontario, Canada. The investigation into the disappearances, taken up by two successive police task forces, eventually led to Bruce McArthur, a 66-year-old self-employed Toronto landscaper, whom they then arrested on January 18, 2018.

Víctor Carranza Niño (8 October 1935 – 4 April 2013), often referred to as Don Víctor was a Colombian emerald dealer and the owner of emerald mines in the Boyacá mountains (a forested area not far from Bogotá), widely known as Colombia's "emerald czar." The economy of the area around the mines is dependent on the trade. Carranza faced several legal challenges and investigations throughout his life.

John Factor (October 8, 1892 – January 22, 1984), born Iakov Faktorowicz and widely known as Jake "The Barber" Factor, was a Prohibition-era gangster and con artist affiliated with the Chicago Outfit.

Pedro Alonso López (born 5 October 1948 – disappeared 22 September 1999), also known as the Monster of the Andes, is a Colombian serial killer, child rapist, and fugitive who murdered a minimum of 110 people, mostly pre-teen girls, from 1978 to 1980. López claimed to have murdered over 300 people in Colombia, Ecuador, and Peru.

Ronald Previte (October 9, 1943 – August 21, 2017) was an American corrupt police officer for the Philadelphia Police Department and a member of and an informant against the Philadelphia crime family of the Italian-American Mafia.

Takahiro Shiraishi (白石隆浩, Shiraishi Takahiro; 9 October 1990 – 27 June 2025) was a Japanese serial killer and rapist. He was also known as the Twitter Killer or the Zama Suicide Pact Killer, which he was labeled as in most media reports at the time of his sentencing.

Kazimierz Polus (10 September 1929 – 15 March 1985) was a Polish serial killer and pedophile who killed two young boys and an adult man.

John Stompanato Jr. (October 10, 1925 – April 4, 1958) was a United States Marine and gangster who became a bodyguard and enforcer for the gangster Mickey Cohen.

William Clyde Gibson III (born October 10, 1957) is an American serial killer and rapist who is currently on Indiana's death row for the sexually motivated murders of two women in 2002 and 2012, in addition to serving a 65-year sentence for a third murder committed in 2012. A habitual criminal noted for his increasingly violent streaks and his handlebar moustache, Gibson has claimed responsibility for upwards of 30 additional murders across multiple states, none of which have been confirmed.

William Calcraft (11 October 1800 – 13 December 1879) was an English hangman, one of the most prolific of British executioners. It is estimated in his 45-year career he carried out 450 executions.

Lynwood Crumpler Drake III (October 10, 1949 – November 8, 1992) was an American spree killer who killed six people and wounded one other at two homes in Morro Bay and a card-playing club in Paso Robles, California, United States on November 7, 1992. He then drove to another house in San Miguel, where he took the owner hostage, before killing himself the next morning.

Martha Marek (née Löwenstein; 10 October 1897 – 6 December 1938) was an Austrian serial killer who caused media attention during the interwar period.

Mieczysław Zub (10 October 1953 – 29 September 1985) was a Polish serial killer who killed 4 women in Silesian Voivodeship. The Milicja Obywatelska gave him the pseudonym Fantomas.

Kang Ho-sun (Korean: 강호순; Hanja: 姜浩順; born October 10, 1969) is a South Korean serial killer who was sentenced to death in 2009 for killing 10 women between October 2005 and December 2008, including his wife and her mother.

Eduardo Arellano Félix (born October 11, 1956) is a Mexican drug trafficker, brother of Benjamín, Ramón, Javier and sister, Enedina, all drug traffickers. The Arellano-Félix Organization, also known as the Tijuana Cartel, has been responsible for numerous murders and the smuggling of thousands of tons of marijuana, cocaine, heroin and methamphetamine for more than a decade.

Craig Chandler Price (born October 11, 1973) is an American serial killer who committed his crimes in Warwick, Rhode Island between the ages of 13 and 15. He was arrested in 1989 for four murders committed in his neighborhood: a woman and her two daughters that year, and the murder of another woman two years earlier.

Aleksandr Ivanovich Berlizov (Russian: Александр Иванович Берлизов; 12 October 1946 – summer 1974) was a Soviet serial killer who operated in Tikhoretsk and Dnipropetrovsk. He was known as The Night Demon.

There are obvious inconsistencies between this article and John Foxton, see talk page

Ion Rîmaru ([iˈon rɨˈmaru]; modern spelling Râmaru; 12 October 1946 – 23 October 1971) was a Romanian serial killer dubbed the Vampire of Bucharest (Vampirul din București) or the Blondes' Killer (criminalul blondelor). Rîmaru terrorized Bucharest between 1970 and 1971, killing four women and attacking more than ten others.

Carl Anthony Williams (13 October 1970 – 19 April 2010) was an Australian convicted murderer and drug trafficker from Melbourne, Victoria. He was a central figure in the Melbourne gangland killings as well as their final victim.