Ensio Kalevi Koivunen (23 June 1930 – 27 May 2003) was a Finnish serial killer who poisoned three female hitchhikers using carbon monoxide in the summer of 1971, and thereby got the nickname Häkä-Enska ("Carbon monoxide-Enska").

Choi Seo-won (Korean: 최서원; born 23 June 1956 as Choi Soon-sil; Korean: 최순실; pronounced [t͡ɕʰø.sun.ɕil]) is a South Korean businesswoman known primarily for her involvement in the 2016 South Korean political scandal, stemming from her influence over the 11th President of South Korea, Park Geun-hye. In 2018, a court sentenced Choi to 20 years in prison on corruption charges.

George Feigley (June 23, 1940 – April 13, 2009) was an American church leader. He has been described as a sex cult leader.

Edward VIII (Edward Albert Christian George Andrew Patrick David; 23 June 1894 – 28 May 1972), later known as the Duke of Windsor, was King of the United Kingdom and the British Dominions, and Emperor of India, from 20 January 1936 until his abdication in December of the same year.

Ioannis Varvakis (Greek: Ιωάννης Βαρβάκης; 1745–1825), also known as Ivan Andreevich Varvatsi (Russian: Иван Андреевич Варваци), was a Greek privateer, benefactor, and member of the Filiki Eteria.

Charles Joseph Whitman (June 24, 1941 – August 1, 1966) was an American mass murderer and Marine veteran who became known as the "Texas Tower Sniper". On August 1, 1966, Whitman used knives to kill his mother and his wife in their respective homes, then went to the University of Texas at Austin (UT Austin) with multiple firearms and began indiscriminately shooting at people.

Jean-Baptiste Benoît Eyriès (French: [ʒɑ̃ batist bənwa ɛːʁjɛs]; 24 June 1767 – 13 June 1846) was a French geographer, author and translator, best remembered in the English speaking world for his translation of German ghost stories Fantasmagoriana, published anonymously in 1812, which inspired Mary Shelley and John William Polidori to write Frankenstein and The Vampyre respectively. He was one of the founding members of the Société de Géographie, a member of the Société Asiatique, Académie des Inscriptions et Belles-Lettres, American Philosophical Society, and American Academy of Arts and Sciences, and was awarded the Legion of Honour.

Giovanni Pandico (born June 24, 1944) is a former Italian Camorrista who was a member of the Nuova Camorra Organizzata (NCO), a Camorra organization in Naples. Pandico rose to become one of Camorra boss, Raffaele Cutolo's underwriters within the organization.

Sir James La Roche, 1st Baronet (24 June 1734 – September 1804), or Laroche, was an English slave trader and politician. He was a younger son of John LaRoche, Member of Parliament.

Sean Vincent Gillis (born June 24, 1962) is an American serial killer and sex offender who murdered eight women in and around Baton Rouge, Louisiana, from 1994 until his arrest in April 2004. In his initial arrest, he was charged with three counts of first degree murder and three counts of ritualistic acts in the murders of 29-year-old Katherine Hall, 45-year-old Johnnie Mae Williams and 43-year-old Donna Bennett Johnston.

Walter Earl Ellis (June 24, 1960 – December 1, 2013), known as the Milwaukee North Side Strangler, was an American serial killer who raped and strangled at least seven women in the city of Milwaukee, Wisconsin between 1986 and 2007. Until May 2009, the killings were considered to be independent of one another, but were then linked together via DNA profiling.

Juan Manuel José Domingo Ortiz de Rozas y López de Osornio (30 March 1793 – 14 March 1877), nicknamed "Restorer of the Laws", was an Argentine politician and army officer who ruled Buenos Aires Province and briefly the Argentine Confederation. Born into a wealthy family, Rosas independently amassed a personal fortune, acquiring large tracts of land in the process.

Anthony Allen Shore (June 25, 1962 – January 18, 2018) was an American serial killer and child molester who was responsible for the murders of one woman and three girls. He was active from 1986 to 2000, and became known as the "Tourniquet Killer" because of his use of a ligature with either a toothbrush or bamboo stick to tighten or loosen the ligature.

Surgeon General Shirō Ishii (Japanese: 石井 四郎, Hepburn: Ishii Shirō; [iɕiː ɕiɾoː]; 25 June 1892 – 9 October 1959) was a Japanese biological weapons specialist, microbiologist and army medical officer who served as the director of Unit 731, the largest biological warfare and chemical warfare unit of the Imperial Japanese Army.

Robert John Maudsley (born 26 June 1953) is an English serial killer. Maudsley first killed a man who showed him pictures of children he had sexually abused.

Reis Sedat Peker (Turkish: [(re'jis) seˈdat peˈcæɾ]; born 26 June 1971) is a Turkish mafia leader and whistle-blower who has made multiple allegations regarding Turkish politicians and alleged government involvement in illegal activities through his YouTube channel. He identifies himself as a pan-Turkist and Turanist.

Yevgeny Olegovich Nagorny (Russian: Евге́ний Оле́гович Наго́рный; born 26 June 1972) is a Ukrainian-born serial killer, who organized a car repair service in which he killed the vehicle owners in order to sell their cars.

Kurt Niklas Lindgren (born 26 June 1972, in Sörmjöle, Umeå Municipality), known in the media prior to his arrest as Hagamannen ("The Haga Man"), is a convicted Swedish serial rapist. Lindgren was convicted of nine counts of sexual assault in 2006, two of which were labeled attempted murder, in relation to attacks in the city of Umeå from 1998 to 2005.

Denis Georges Waxin (born 26 June 1968) is a French serial killer and serial rapist who attacked at least six children in Lille and its suburbs from 1985 to 1999, killing three girls, raping two boys and another girl. He was convicted for his proven crimes and sentenced to life imprisonment with 29 years of preventative detention.

Admiral Sir Thomas Frankland, 5th Baronet (26 June 1718 – 21 November 1784) was a Royal Navy officer, politician and slave trader. He was the second son of Henry Frankland and Mary Cross.

Laurenzius Marie "Lorenz" Hackenholt (26 June 1914 – missing 1945, declared legally dead as of 31 December 1945, but believed to have still been alive) was a member of the Schutzstaffel (SS) with the rank of Hauptscharführer (First Sergeant). During World War II Hackenholt built and operated the gas chamber at the Bełżec extermination camp in occupied Poland during Operation Reinhard.

Willi Kimmritz (26 June 1912 – 26 July 1950), known as The Horror of the Brandenburg Forest (German: Der Schrecken der brandenburgischen Wälder), was a German serial killer, rapist and burglar who robbed and raped women in the forested areas surrounding Berlin from 1946 to 1948, killing four. He was convicted for 13 rapes and three of the murders, sentenced to death and executed in 1950.

Francisco Macías Nguema (born Mez-m Ngueme, later Africanised to Masie Nguema Biyogo Ñegue Ndong; 1 January 1924 – 29 September 1979), often referred to as Macías Nguema or simply Macías, was an Equatoguinean politician who served as the first president of Equatorial Guinea from the country's gaining of independence in 1968, until his overthrow in 1979. He is widely remembered as one of the most brutal dictators in history.

Leonard John Fraser (27 June 1951 – 1 January 2007), also known as The Rockhampton Rapist, was an Australian convicted serial killer and rapist.

Salvatore Russo (Italian pronunciation: [salvaˈtoːre ˈrusso]; born 27 June 1958 in Nola) is an Italian Camorrista and boss of the Russo clan from Nola, which he co-founded. He has been running the clan together with his brother Pasquale for over thirty years.

Norio Nagayama (永山 則夫, Nagayama Norio; June 27, 1949 – August 1, 1997) was a Japanese spree killer and novelist.

Vincenzo Licciardi (Italian pronunciation: [vinˈtʃɛntso litˈtʃardi]; born June 27, 1965) is the boss of the Licciardi clan, and one of the main leaders of the Secondigliano Alliance, a Camorra crime syndicate operating in Naples and the surrounding Campania region. His nickname is 'o Chiatto ("Fatso").

Mark Alan Smith (born June 27, 1949) is an American serial killer who killed at least four women in Illinois and Arkansas during the 1960s, and was sentenced to 500 years' imprisonment for three of the deaths. Smith later confessed to killing eight women while stationed as a soldier in West Germany, for which he was never prosecuted, and authorities believe he could be involved in other murders, both in the US and overseas.

Piotr Śmietański (27 June 1899 – 23 February 1950) was a Polish non-commissioned officer and communist functionary in the Ministry of Public Security and executioner at Mokotów Prison.

The Hanau shootings (German: Anschläge in Hanau) occurred on 19 February 2020, when ten people were killed and five others wounded in a terrorist shooting spree by a far-right extremist targeting three bars and a kiosk in Hanau, near Frankfurt, Hesse, Germany. After the attacks the gunman, Tobias Rathjen, returned to his apartment, where he killed his mother and then committed suicide.

Ion Andreevich Prodan (Russian: Ион Андреевич Продан; born 13 August 1968), known as The Upyr of Domodedovo (Russian: Домодедовский упырь), is a Moldovan serial killer who committed his murders in the Moscow Oblast.

Tommy Lynn Sells (June 28, 1964 – April 3, 2014) was an American serial killer who became known as the Coast to Coast Killer. Although he was convicted of only two murders, one of which he was sentenced to death and eventually executed for, Sells claimed to have killed up to 70 victims in various states.

Aribert Ferdinand Heim (28 June 1914 – 10 August 1992), also known as Dr. Death and Butcher of Mauthausen, was an Austrian Schutzstaffel (SS) doctor.

Benedetto Capizzi (28 June 1944 – 12 September 2023) was an Italian mobster and a boss of the Sicilian Mafia, from the Villagrazia area of Palermo. He was nominated to be the head of the new Sicilian Mafia Commission.

Alexander Fedorovich Taran (Russian: Александр Фёдорович Таран; born 1951), known as The Voroshilov Sharpshooter (Russian: Ворошиловский стрелок), is a Russian beekeeper who committed a series of attempted and accomplished murders in order to avenge the death of his children.

Henry VIII (28 June 1491 – 28 January 1547) was King of England from 22 April 1509 until he died in 1547. After the pope refused to annul his marriage to Catherine of Aragon, Henry passed legislation that severed England and Ireland from the Roman Catholic Church and established the monarch as Supreme Head of the Church of England, initiating the English Reformation.

Michael "Mickey" Munday (born June 29, 1945) is an American former drug trafficker and former associate of Colombia's Medellin Cartel during the growth phase in cocaine trafficking, 1975–1986. Munday was featured in the 2006 Rakontur documentary, Cocaine Cowboys.

Peter William Sutcliffe (2 June 1946 – 13 November 2020), also known as Peter Coonan, was an English serial killer who was convicted of murdering thirteen women and attempting to murder seven others between 1975 and 1980. Press reports dubbed him the Yorkshire Ripper, an allusion to the Victorian serial killer Jack the Ripper.

Olga Hepnarová (30 June 1951 – 12 March 1975) was a Czech rampage killer, who on 10 July 1973, killed eight people by ramming them with a truck in Prague. Hepnarová was convicted and sentenced to death, and was executed in 1975.

Sir Abraham Elton, 2nd Baronet (baptised 30 June 1679 – 20 October 1742) of Bristol and Clevedon Court, Somerset, was a British merchant, slave trader and Whig politician, who sat in the House of Commons for Taunton between 1724 and 1727, and then for Bristol from 1727 until his death in 1742. He also served as the High Sheriff of Bristol from 1710 to 1711, and was Mayor of Bristol for the year 1719 to 1720.

Matthew James Harris (born 30 June 1968) is an Australian serial killer from Wagga Wagga, New South Wales, currently serving two sentences of life imprisonment plus 40 years' imprisonment without the possibility of parole for the murder of three people in and around Wagga Wagga in October and November 1998.

Sergei Ivanovich Dovzhenko (Russian: Серге́й Иванович Довже́нко, Ukrainian: Сергій Іванович Довже́нко, romanized: Serhii Ivanovych Dovzhenko; born June 30, 1972) is a Ukrainian serial killer. A former operative of the Mariupol police, he confessed to committing 19 murders between November 1998 and May 2002 in his native city.

Ahmed Omar Saeed Sheikh (Urdu: احمد عمر سعید شیخ; sometimes known as Umar Sheikh, Sheikh Omar, Sheik Syed or by the alias Mustafa Muhammad Ahmad; born 23 December 1973) is a British Pakistani terrorist. He became a member of the Islamist jihadist group Harkat-ul-Ansar or Harkat-ul-Mujahideen in the 1990s, and later of Jaish-e-Mohammed and was closely associated with Al-Qaeda.