Franz Fuchs (12 December 1949 – 26 February 2000) was an Austrian domestic terrorist and mass murderer who killed four people and injured 15, some seriously, using three improvised explosive devices and 24 mail bombs, which he sent in five waves between 1993 and 1997.

Edward Joseph Leonski (12 December 1917 – 9 November 1942) was a United States Army soldier and serial killer responsible for the strangling murders of three women in Melbourne, Australia, in 1942. Leonski was dubbed the Brownout Strangler, after the practice of dimming or restricting outdoor lighting to make the city less visible to potential enemy aircraft during nighttime raids.

Martin Ney (born 12 December 1970) is a German convicted serial killer and child sex offender.

Gilbert Paul Jordan (born Gilbert Paul Elsie; December 12, 1931 – July 7, 2006), known as The Boozing Barber, was a Canadian serial killer who is believed to have committed the so-called "alcohol murders" in Vancouver, British Columbia.

General Cao Kun (simplified Chinese: 曹锟; traditional Chinese: 曹錕; pinyin: Cáo Kūn; Wade–Giles: Ts'ao K'un; courtesy name: Zhongshan (仲珊); December 12, 1862 – May 15, 1938) was a Chinese warlord and politician, who served as the President of China from 1923 to 1924, as well as the military leader of the Zhili clique in the Beiyang Army.

Robert Surcouf (French pronunciation: [ʁɔbɛʁ syʁkuf]; 12 December 1773 – 8 July 1827) was a French privateer, businessman and slave trader who operated in the Indian Ocean from 1789 to 1808 during the French Revolutionary and Napoleonic Wars. Capturing over 40 prizes, he later amassed a large fortune from a variety of commercial activities, such as ship-owning, privateering, slave trading and owning land.

Richard Lawrence Marquette (also known as Dick Marquette; born December 12, 1934) is an American serial killer who killed three women, drained their blood, mutilated and dismembered their bodies, and scattered their remains between 1961 and 1975. He was the first person to be added as an eleventh name on the FBI Ten Most Wanted List, in connection with the 1961 murder of Joan Caudle in Portland, Oregon.

Toivo Harald "Kirves" Koljonen (12 December 1910 – 21 October 1943) was a Finnish mass murderer and the last Finn executed for a civilian crime. He was executed by firing squad for a sextuple murder.

Arnold Karl Sodeman ((1899-12-12)12 December 1899 – (1936-06-01)1 June 1936), also known as the School-girl Strangler, was an Australian serial killer who targeted children. He confessed to four killings, and was executed at Pentridge Prison in 1936.