Louis Poirson, nicknamed "Rambo" (born September 1962 in Madagascar), is a French rapist and serial killer.

Madumetsa Jack Mogale (born September 1968), dubbed the West-End Serial Killer by police, is a South African serial killer who killed 16 people in 2008 and 2009. On 17 February 2011, Mogale was convicted on 52 of 61 charges related to 16 murders, 19 rapes, and 9 kidnappings.

John W. Hulbert Jr.

Théodore Canot (1804–1860) was a slave trader and writer of Franco-Florentine origin.

Stanley William Cross was an English executioner from Wormwood Scrubs. His career lasted from 1932 to 1941, during which he carried out four hangings as a chief executioner and assisted at 20 others.

Raúl Osiel Marroquín Reyes (born September 1, 1980), also known as El Sádico, is a Mexican kidnapper and serial killer responsible for six kidnappings, four of which ended in murder, in Mexico City.

Mehmed Talât Pasha (1 September 1874 – 15 March 1921), commonly known as Talaat Pasha or Talat Pasha, was a Turkish activist, revolutionary, politician, and convicted war criminal who served as the de facto leader of the Ottoman Empire from 1913 to 1918. He was chairman of the Union and Progress Party, which operated a one-party dictatorship in the Empire; during World War I he became Grand Vizier (prime minister).

Joseph Francel (September 2, 1895 – January 25, 1981) was an American electrician from Cairo, New York, who was the state of New York's executioner from October 12, 1939 until 1953.

During the weekend of July 4, 1999, white supremacist Benjamin Smith targeted ethnic and racial minorities (with victims including nine Orthodox Jews, two African-American men, and a Korean man), in a three-day drive-by shooting rampage in the U.S. states of Illinois and Indiana, after which he committed suicide.

Robert “Bob” Zarinsky (September 2, 1940 – November 28, 2008) was an American serial killer who killed three teenage girls in Monmouth County, New Jersey, between 1965 and 1969. Convicted of one of these murders and sentenced to life in prison, he was also a suspect in four other murders, including the 1958 murder of a police officer in Rahway, but he was later acquitted for that crime.

Zhao Zhihong (simplified Chinese: 赵志红; traditional Chinese: 趙志紅; pinyin: Zhào Zhìhóng; 5 September 1972 – 30 July 2019), nicknamed The Smiling Killer and Demon, was a Chinese serial killer and rapist. He admitted to committing a total of 20 serious crimes between 1996 and 2005, including raping and killing eleven women in Ulanqab and Hohhot in Inner Mongolia.

Werner Eduard Fritz von Blomberg (2 September 1878 – 13 March 1946) was a German field marshal and politician who served as the first Minister of War in Nazi Germany from 1933 to 1938. Blomberg had served as Chief of the Truppenamt, equivalent to the German General Staff, during the Weimar Republic from 1927 to 1929.

James Joseph "Whitey" Bulger Jr. ( ; September 3, 1929 – October 30, 2018) was an American organized crime boss who led the Winter Hill Gang, an Irish mob group based in the Winter Hill neighborhood of Somerville, Massachusetts, northwest of Boston.

Ferdinand Porsche (3 September 1875 - 30 January 1951) was an Austrian-German automotive engineer and founder of the Porsche AG. He is best known for creating the first gasoline-electric hybrid vehicle (Lohner-Porsche), the Volkswagen Beetle, the Auto Union racing cars, the Mercedes-Benz SS/SSK, and several other important developments and Porsche automobiles.

Jacques Maurice Fruminet (4 September 1959 – 7 June 2014), was a French serial killer and multi-recidivist criminal.

On October 27, 2018, a mass shooting occurred at the Tree of Life – Or L'Simcha Congregation synagogue in the Squirrel Hill neighborhood of Pittsburgh, Pennsylvania. The congregation, along with New Light Congregation and Congregation Dor Hadash, which also worshiped in the building, was attacked during Shabbat morning services.

Hafiz Hamzayevich Razzakov (Russian: Хафиз Хамзаевич Раззаков; born 5 September 1975), known as The Borovets Maniac (Russian: Боровецкий маньяк), is an Uzbekistani-born Russian terrorist and serial killer who murdered nine people in the city of Naberezhnye Chelny from June to October 2004. Razzakov - a member of an extremist Islamist organization named Islamic Djamaat (Russian: Исламский джамаат) - targeted victims he considered to be infidels.

Adnan Çolak (born 5 September 1952) is a Turkish serial killer and rapist known as "Baltalı Katil" ("The Axe Murderer") or "Artvin Canavarı" ("The Beast of Artvin").

Paul Steven Haigh (born 5 September 1957) is an Australian convicted serial killer currently serving six sentences of life imprisonment without the possibility of parole for the murder of six people in the late 1970s. He also murdered a fellow inmate in 1991.

Louis Capone (September 5, 1896 – March 4, 1944) was a New York organized crime figure who became a supervisor for Murder, Inc. Louis Capone had no known relation to Al Capone, the boss of the Chicago Outfit.

Elisabeth Volkenrath (née Mühlau; 5 September 1919 – 13 December 1945) was a German supervisor at several Nazi concentration camps during World War II.

Mark Goudeau (born September 6, 1964), also called the Baseline Killer and the Baseline Rapist, is an American serial killer and kidnapper who committed the rape, robbery, and murder of nine victims in the Phoenix metro area between August 2005 and June 2006. In addition, his extensive crime spree included 77 other felony crimes, totaling 86 felonies over the ten-month period.

Sara María Aldrete Villareal (born September 6, 1964) is a Mexican serial killer who was convicted of murder while heading a drug-smuggling and human sacrifice cult with Adolfo Constanzo. Narcosatanist cults were common in Tamaulipas during the late 80s.

Joël Isidore Matencio (6 September 1948 – 24 January 2022) was a French serial killer and criminal.

Friedrich Reindel (6 September 1824, in Werben (Elbe) – 27 September 1908, in Magdeburg) was Royal Prussian executioner (German: Scharfrichter) from 1873 to 1898. Responsible for carrying out capital punishment in the Prussian provinces, he executed a total of 213 people by beheading with an axe.

Graham Frederick Young (7 September 1947 – 1 August 1990), also known as the Teacup Poisoner, was an English serial killer who murdered his victims with poison.

James Jervey (7 September 1784 – 2 April 1845) was an American slave trader, lawyer, and banker who lived in worked in Charleston, South Carolina, where he co-owned the slave-trading firm of Jervey, Waring & White.

Joachim Knychała (8 September 1952 – 28 October 1985) was a Polish serial killer, known as "The Vampire of Bytom" or "Frankenstein", who murdered five women between 1975 and 1982 in the Upper Silesian industrial region. He was apprehended, sentenced to death and hanged.

Pasquale Scotti (Italian pronunciation: [paˈskwaːle ˈskɔtti]; born 8 September 1958 in Casoria) is an Italian criminal and boss of the Camorra—a Mafia-type organisation in Naples and Campania—involved in the Nuova Camorra Organizzata (NCO), headed by Raffaele Cutolo.

Rezin Pleasant Bowie ( BOO-ee) (September 8, 1793 – January 17, 1841) was an American planter, inventor, and mercenary. He also served three terms in the Louisiana House of Representatives.

Nidal Malik Hasan (born September 8, 1970) is an American former United States Army major, physician, and mass murderer convicted of killing 13 people and injuring 32 others in the Fort Hood mass shooting on November 5, 2009. Hasan, an Army Medical Corps psychiatrist, admitted to the shootings at his court-martial in August 2013.

Paul Michael Stephani (September 8, 1944 – June 12, 1998) was an American serial killer. He was also known as the Weepy-Voiced Killer due to a series of telephone calls he made to police, anonymously reporting his crimes in a remorseful and high-pitched voice.

Harrison Frank "Marty" Graham (born September 9, 1959) is an American serial killer who murdered seven women in Philadelphia, Pennsylvania between mid-1986 to mid-1987, keeping their remains in his apartment. In 1988, he was found guilty on all charges and sentenced to death, but his sentences were later commuted to life imprisonment.

Marie Fikáčková (9 September 1936 – 13 April 1961) was a Czech suspected serial killer, convicted for the killing of two newborn babies in Sušice in 1960. A neonatal nurse, Fikáčková claimed to have killed at least ten newborns between 1957 and 1960, and was executed by hanging in 1961.

Jürgen Wagner (9 September 1901 – 27 June 1947) was a Brigadeführer in the Waffen-SS during World War II, the commander of the SS Division Nederland and was awarded the Knight's Cross of the Iron Cross with Oak Leaves.

Maria Catherina van der Linden-Swanenburg (9 September 1839 – 11 April 1915) was a Dutch serial killer who murdered at least 27 people and was suspected of killing more than 90 people.

Houston Stewart Chamberlain (; 9 September 1855 – 9 January 1927) was a British-German-French philosopher who wrote works about political philosophy and natural science. His writing promoted German ethnonationalism, antisemitism, scientific racism, and Nordicism; he has been described as a "racialist writer".

Paolo Renda (Italian: [ˈpaːolo ˈrɛnda]; September 10, 1939 – disappeared May 20, 2010, later declared dead September 2, 2018) was a Sicilian-Canadian mobster who served as consigliere of the Rizzuto crime family based in Montreal, Quebec, Canada, who has not been seen since May 2010.

Johanna Bormann (10 September 1893 – 13 December 1945) was a German prison guard at several Nazi concentration camps from 1938. She was executed as a war criminal at Hamelin after a court trial in 1945.

Robert Anthony Buell (September 10, 1940 – September 25, 2002) was an American child murderer, serial rapist, and former planning department worker from Akron, Ohio. He was convicted of the July 17, 1982 murder of 11-year-old Krista Lea Harrison.

Willi Herold (11 September 1925 – 14 November 1946), also known as the Executioner of Emsland, was a Nazi German war criminal. Near the end of the Second World War in Europe, Herold deserted from the Luftwaffe and, posing as a captain, organized the mass execution of German deserters held at a prison camp.

Viktor Kalivoda (11 September 1977 – 26 September 2010) was a Czech police officer and spree killer who shot and murdered three people in a forest in Nedvědice over the span of three days October 2005, and was also known by the nickname, the Forest Killer.

Marybeth Roe Tinning (born September 11, 1942) is an American murderer and suspected serial killer who was convicted in New York State of the murder of her ninth child, 4-month-old daughter Tami Lynne, on December 20, 1985. She is suspected to be similarly involved in the previous deaths of her eight children, all of which took place within the span of fourteen years.

Eric David Harris (April 9, 1981 – April 20, 1999) and Dylan Bennet Klebold ( KLEE-bohld; September 11, 1981 – April 20, 1999) were American high school seniors and a mass murderer duo who perpetrated the massacre at Columbine High School on April 20, 1999, in Columbine, Colorado. Harris and Klebold killed 13 students and one teacher and wounded 23 others.

Bashar Hafez al-Assad (born 11 September 1965) is a Syrian former politician, doctor, and military officer who served as the president of Syria from 2000 until his overthrow in 2024 after the Syrian civil war. As president, Assad was commander-in-chief of the Syrian Arab Armed Forces and secretary-general of the Central Command of the Arab Socialist Ba'ath Party.

Gerald Eugene Stano (born Paul Zeininger; September 12, 1951 – March 23, 1998) was an American convicted serial killer. Stano murdered at least 23 young women and girls, confessed to 41 murders, and the police say the number of his victims may be closer to 88.

William Dathan Holbert (born September 12, 1979), alias William Adolfo Cortez and nicknamed "Wild Bill", is an American serial killer/hitman. Originally from North Carolina, he is currently serving a 47-year sentence for the killings of five Americans in Panama.

Ferdinand Gamper (12 September 1957 – 1 March 1996), known as The Monster of Merano, was a serial killer in South Tyrol, Italy. He killed six people in Merano during 1996, before he died.

Clayton Anthony Fountain (September 12, 1955 – July 12, 2004) was an American federal prisoner, member of the Aryan Brotherhood, and a convicted murderer.

Daniel Lee Corwin (September 13, 1958 – December 7, 1998) was an American serial killer who was sentenced to death and executed for murdering three women across three counties in Texas between February and July 1987. After his conviction for an attempted murder, he was confessed to the previous crimes, for which he was tried, convicted, and eventually executed.