Edgar Valdez Villarreal (born August 11, 1973), also known as La Barbie ("The Barbie"), is a Mexican-American former drug lord and high-ranking lieutenant of the Beltrán Leyva Cartel. Valdez is serving a 49-year prison sentence at USP Coleman II in Florida.

Mark James Robert Essex (August 12, 1949 – January 7, 1973) was an American serial sniper and black nationalist known as the "New Orleans Sniper" who killed a total of nine people, including five police officers, and wounded twelve others, in two separate attacks in New Orleans on December 31, 1972, and January 7, 1973. Essex was killed by police in the second armed confrontation.

Muhammad Ahmad bin Abdullah bin Fahal (Arabic: محمد أحمد بن عبد الله بن فحل; 12 August 1843 – 21 June 1885) was a Sudanese religious and political leader. In 1881, he claimed to be the Mahdi and led a war against Egyptian rule in Sudan, which culminated in a remarkable victory over them in the Siege of Khartoum.

Karl Denke (11 February 1860 – 22 December 1924) was a German serial killer and cannibal who killed and cannibalized dozens of homeless vagrants and travellers from 1903 to 1924. He has been nicknamed the Cannibal of Münsterberg and the Forgotten Cannibal.

Willem van Eijk (13 August 1941 – 19 June 2019) was a convicted Dutch serial killer known as "Het Beest van Harkstede" (The Beast of Harkstede). He was convicted twice for a total of five murders.

Cary Anthony Stayner (born August 13, 1961) is an American serial killer and the older brother of kidnapping victim Steven Stayner. He worked as a mechanic in Mariposa County, California, and murdered four women between February and July 1999, dumping their bodies near Yosemite National Park, leading to him being dubbed the Yosemite Park Killer or simply the Yosemite Killer.

Carl Peter Herman Christensen (13 August 1869 in Særslev – 9 October 1936) was the last executioner (skarpretter) in office for the government of Denmark. He was hired by justice minister, Peter Adler Alberti and held the office from 27 August 1906 until 1 April 1926.

Peter Kudzinowski (August 13, 1903 – December 21, 1929) was an American serial killer who was linked to at least three murders committed within a four-year span.

Jacques Plumain (born 14 August 1973), known as The Ghost of Kehl (French: Fantôme de Kehl), is a French suspected serial killer who was convicted of killing two women in Germany and France from 1999 to 2001, but is considered a suspect in three others, being acquitted for one and never brought to trial for the other two.

Raymond Lee Washington (August 14, 1953 – August 9, 1979) was an American gangster, known as the founder of the Crips gang in Los Angeles. Washington formed the Crips as a minor street gang in the late 1960s in South Los Angeles, becoming a prominent local crime boss.

Ronald Adrin Gray (born August 14, 1965) is an American serial killer and rapist whose convictions include four counts of murder, one count of attempted murder and eight counts of rape. His crimes were committed when he was in the United States Army, stationed at Fort Bragg, North Carolina.

Joachim Mrugowsky (15 August 1905 – 2 June 1948) was a Nazi bacteriologist who committed medical atrocities at the Sachsenhausen concentration camp. He was Associate Professor, Medical Doctorate, Chief of Hygiene Institute of the Waffen-SS, Senior Hygienist at the Reich, SS-Physician, SS and Waffen-SS Colonel.

Miguel Ángel Rodríguez Orejuela (born August 15, 1943) is a convicted Colombian drug lord, formerly one of the leaders of the Cali Cartel, based in the city of Cali. He is the younger brother of Gilberto Rodríguez Orejuela.

Ermias Joseph Asghedom (born Airmiess Joseph Asghedom; August 15, 1985 – March 31, 2019), known professionally as Nipsey Hussle, was an American rapper, activist and entrepreneur. Emerging from the West Coast hip-hop scene in the mid-2000s, Hussle self-released his debut mixtape, Slauson Boy Volume 1, to moderate local success, leading him to sign with Cinematic Music Group and Epic Records.

Igor Anatolievich Irtyshov (Russian: Игорь Анатольевич Иртышов; born 16 August 1971 — died February 2021) was a Russian serial child rapist and child murderer. He was sentenced to death for several rapes of young boys, two of which ended in fatalities.

Thomas Berry Bruce (August 16, 1919 – October 12, 1994) was the Mississippi executioner active from 1957 until 1987, during which time he was the only US executioner on public record. He executed between 14 and 16 people, including Jimmy Lee Gray, during his career.

Johann "Jack" Unterweger (16 August 1950 – 29 June 1994) was an Austrian serial killer who committed at least twelve murders in Austria, West Germany, Czechoslovakia and the United States.

Théoneste Bagosora (16 August 1941 – 25 September 2021) was a Rwandan military officer. He was chiefly known for his key role in the 1994 Rwandan genocide for which he was sentenced to life imprisonment by the International Criminal Tribunal for Rwanda (ICTR).

John Donald Merrett (17 August 1908 – 16 February 1954) was a British murderer and convicted fraudster also known under the name of Ronald John Chesney in later life. He left a wide trail of damage but escaped with minimal punishment.

Salvatore Mancuso Gómez, also known as "el Mono Mancuso", "Santander Lozada" or "Triple Cero" (i.e. "Triple Zero", or, "000"), among other names (born August 17, 1964 in Montería, Córdoba) is a Colombian paramilitary leader, once second in command of the United Self-Defense Forces of Colombia (AUC) paramilitary group.

Mohammed Emwazi (born Muhammad Jassim Abdulkarim Olayan al-Dhafiri; Arabic: محمد جاسم عبد الكريم عليان الظفيري;‎, commonly referred to as Jihadi John (17 August 1988 – 12 November 2015) was a British militant of Kuwaiti origin seen in several videos produced by the Islamist extremist group Islamic State (IS) showing the beheadings of a number of captives in 2014 and 2015. A group of his hostages nicknamed him "John" since he was part of a four-person terrorist cell with English accents whom they called 'The Beatles'; the press later began calling him "Jihadi John".

Dilawar Singh (18 August 1970 – 31 August 1995) was the assassin of Beant Singh, the chief minister of Punjab, India amid the insurgency in Punjab. He was a serving Punjab Police officer and became a suicide bomber for the Babbar Khalsa International.

Boris Efimovich Serebryakov (Russian: Бори́с Ефи́мович Серебряко́в; 18 August 1941 – 1971), known as The Kuybyshev Monster (Russian: Куйбышевский монстр), was a Soviet serial killer, necrophile and mass murderer who operated in Kuybyshev (present-day Samara). He killed nine people with exceptional cruelty and caused grievous bodily harm to three others.

Genghis Khan (born Temüjin; c. 1162 – August 1227), also known as Chinggis Khan, was the founder and first khan of the Mongol Empire.

Joseph Léonce Di Mambro (19 August 1924 – 5 October 1994) was a French esotericist who founded and led the Order of the Solar Temple alongside Luc Jouret. Di Mambro had been associated with a variety of esoteric groups before founding OTS.

Anthony Edward Sowell (August 19, 1959 – February 8, 2021) was an American serial killer and rapist known as The Cleveland Strangler. He was convicted in 2011 of murdering 11 women whose bodies were discovered at his Cleveland, Ohio, home in 2009.

William Lester Suff (born Bill Lee Suff; August 20, 1950) is an American serial killer who tortured and killed at least thirteen women in Riverside County, California, from 1986 to 1991, earning nicknames such as the Riverside Prostitute Killer and the Lake Elsinore Killer, as some of his victims were dumped in Lake Elsinore. Years earlier, in 1973, he murdered his two-month-old daughter in Texas, a crime for which he had only served ten years of a seventy-year sentence.

Carlos Alberto Arellano Félix (born August 20, 1955) is a Mexican medical doctor who is known for his illegal involvement in money laundering for the Tijuana Cartel. Carlos was born on the 20th of August in the year 1955 in the city of Culiacán, Sinaloa.

Slobodan Milošević (Serbian Cyrillic: Слободан Милошевић, pronounced [slobǒdan milǒːʃevitɕ] , 20 August 1941 – 11 March 2006) was a Yugoslav and Serbian politician who was the president of Serbia between 1989 and 1997 and president of the Federal Republic of Yugoslavia from 1997 until his overthrow in 2000. Milošević played a major role in the Yugoslav Wars and became the first sitting head of state charged with war crimes.

Ivan Stang (born Douglass St. Clair Smith; August 21, 1953) is an American writer, filmmaker and broadcaster, best known as the author and publisher of the first screed of the Church of the SubGenius.

Tsutomu Miyazaki (宮﨑 勤, Miyazaki Tsutomu; 21 August 1962 – 17 June 2008) was a Japanese serial killer who murdered four young girls in Tokyo and Saitama Prefecture between August 1988 and June 1989. He abducted and killed the girls, aged from 4 to 7, in his car before dismembering them and molesting their corpses.

George Clarence "Bugs" Moran (; born Adelard Leo Cunin; August 21, 1893 – February 25, 1957) was an American Chicago Prohibition-era gangster. He was incarcerated three times before his 21st birthday.

Benjamin Boyd (21 August 1801 – 15 October 1851) was a Scottish entrepreneur who became a major shipowner, banker, grazier, politician and blackbirder in the British colony of New South Wales. He was briefly a member of the Legislative Council.

Jaroslava Fabiánová (born 1965) is a Czech serial killer who committed a total of four financially motivated murders between 1981 and 2003. She is currently serving a life imprisonment sentence for four murders and other crimes.

Yukio Yamaji (山地 悠紀夫, Yamaji Yukio; August 21, 1983 – July 28, 2009) was a Japanese serial killer. He murdered his own mother in 2000, was imprisoned, and then paroled in 2003.

Sachiko Eto (江藤 幸子, Etō Sachiko; August 21, 1947 – September 27, 2012), known as The Drumstick Killer, was a Japanese cult leader and serial killer, responsible for six murders in Sukagawa City between 1994 and 1995.

David Alan Gore (August 21, 1953 – April 12, 2012) was an American serial killer who committed six murders in Vero Beach and Indian River County, Florida, from 1981 to 1983. He was accompanied in several of the murders by his cousin, Fred Waterfield, and both have collectively been dubbed the Killing Cousins.

Du Yuesheng (22 August 1888 – 16 August 1951), nicknamed "Big-Eared Du", was a Chinese mob boss who spent much of his life in Shanghai. He made his fortune in the opium trade before transforming into a financial tycoon.

Henry Lee Lucas (August 23, 1936 – March 12, 2001), also known as The Confession Killer, was an American convicted murderer. Lucas was convicted of murdering his mother in 1960 and two others in 1983.

Giorgio William Vizzardelli (23 August 1922 – 11 August 1973) was an Italian serial killer.

Marie Noe (August 23, 1928 – May 5, 2016) was an American woman who was convicted in June 1999 of murdering eight of her children. Between 1949 and 1968, eight of the ten Noe children died of mysterious causes which were then attributed to sudden infant death syndrome.

Henry Every, also known as Henry Avery (born 20 August 1659; disappeared June 1696), sometimes erroneously given as Jack Avery or John Avery, was an English pirate who operated in the Atlantic and Indian oceans in the mid-1690s. He probably used several aliases throughout his career, including Benjamin Bridgeman, and was known as Long Ben to his crewmen and associates.

Rodney James Alcala (born Rodrigo Jacques Alcala; August 23, 1943 – July 24, 2021), also known as John Berger and John Burger, was an American serial killer and convicted sex offender who was sentenced to death in California for five murders committed between 1977 and 1979. He pleaded guilty and received two sentences, both twenty-five years to life, for two further murders committed in New York State.

Karl Babor (23 August 1918 – 18 January 1964) was an Austrian Nazi, SS doctor of the Third Reich, and officer at Camp Gross-Rosen with the rank of Hauptsturmführer. He was an expert in assassination by syringe of phenol.

Richard Fran Biegenwald (August 24, 1940 – March 10, 2008) was an American serial killer and arsonist who murdered six people, four women and two men, in Monmouth County, New Jersey, between 1958 and 1983. He is suspected in at least two other murders.

Patrick Tissier (born 24 August 1952) is a French serial killer and rapist who was convicted of killing three people from 1971 to 1993 in the southern regions of France. His case, along with that of Christian Van Geloven, led to a reform in the penal code in regard to the treatment of child murderers.

Dontae Rashawn Morris (born August 24, 1985) is an American serial killer who shot and killed five people in Tampa between May and June 2010. He was initially sentenced to three death sentences in two cases (10-CF-10203A in 2014 & 10-CF-10373A in 2015).

Luise Brunner (25 August 1908 – 8 December 1977) was a German concentration camp guard in Auschwitz II (1942 – late 1944) and the chief oberaufseherin (chief guard) of Ravensbrück concentration camp from December 1944 to April 1945.

Choi Tae-min (Korean: 최태민; 5 May 1912 – 1 May 1994) was the leader of the Church of Eternal Life, a South Korean cult combining elements of Buddhism, Christianity, and traditional Korean Shamanism. Choi, originally a Buddhist monk, then a convert to Presbyterian pastor, was married six times.

Ivan IV Vasilyevich (Russian: Иван IV Васильевич; 25 August [O.S. 15 August] 1530 – 28 March [O.S.