The United States Patent and Trademark Office granted Baekeland a patent for a " Method of making insoluble products of phenol and formaldehyde " on December 7, 1909.

Bogdanov was then involved with setting up Vpered, which ran the Capri Party School from August to December 1909.

* G. Jean-Aubry, “ Isaac Albéniz 1860 – 1909 ,” The Musical Times, Vol 58 No. 898, Musical Times Publications Ltd., December 1917 pgs 535 – 538.

William Jan Berry ( born in Los Angeles, California April 3, 1941 ; died March 26, 2004 ), was the son of aeronautical engineer William L. Berry ( born December 7, 1909 in The Bronx, NY ; died December 19, 2004 in Camarillo, California ), who had been project manager of the " Spruce Goose " and flew on its only flight with Howard Hughes, and Clara Lorentze Mustad Berry ( born September 2, 1919 in Bergen, Norway ; died July 9, 2009 ).

President William Howard Taft devoted a considerable portion of his First Annual Message to Congress ( December 7, 1909 ) to the Liberian question, noting the close historical ties between the two countries that gave an opening for a wider intervention:

* Order of St. Anne, 3rd degree ( 1903 ) and 2nd degree ( 6 December 1909 )

Victor Borge ( ; 3 January 1909 – 23 December 2000 ),

The decade from January 1, 1900 to December 31, 1909 is sometimes referred to as the 1900s, " the nineteen hundreds ", although this term can equally be used for the years 1900 – 1999.

* December 17 – Dana Andrews, American actor ( b. 1909 )

* December 13 – Heather Angel, English actress ( b. 1909 )

* December 23 – Reginald Miles Ansett, Australian businessman and aviator ( b. 1909 )

It was then at the Manhattan Opera House in 1909 with Luisa Tetrazzini, John McCormack, and Charles Gilibert, and again with Frieda Hempel and Antonio Scotti in the same roles at the Met on December 17, 1917.

In December 1909, Knollys thought the proposal to create peers or give the prime minister the right to do so " outrageous " and that the King should abdicate – the King did talk of doing so that winter, but this was probably a symptom of his illness.

In December 1909 Cobb returned and rendered his accounts for his Asia trip that year.

Leopold II (, ) ( 9 April 1835 – 17 December 1909 ) was the King of the Belgians, and is chiefly remembered for the founding and brutal exploitation of the Congo Free State.

On December 17, 1909, Leopold II died at Laeken, and the Belgian crown passed to Albert, the son of Leopold's brother, Philip, Count of Flanders.

* Leopold II also engaged in a religious ceremony with Blanche Zélia Joséphine Delacroix, also known as Caroline Lacroix, a prostitute, on 14 December 1909, with no validity under Belgian law, at the Pavilion of Palms, Royal Palace of Laken, in Brussels, five days before his death.

Following the death of his uncle, Leopold II, Albert succeeded to the Belgian throne in December 1909, since Albert's own father had already died in 1905.

** Zemio ca. 1872 established ; December 11, 1894 under Congo Free State protectorate, April 12, 1909 under French protectorate ; 1923 Sultanate suppressed

She married Arthur Grenbry Outhwaite on 8 December 1909 and thereafter was generally known as Ida Rentoul Outhwaite.

Franz Scholz ( 10 December 1909 – 1 September 1998 ) was a German priest and professor of theology from Breslau, Silesia.

Among these was his son, David G. ( Dode ) MacKenzie, who, in December 1909, was shot ( possibly murdered ) in La Beau, South Dakota, while also working for Matador.

David Dean Rusk ( February 9, 1909 – December 20, 1994 ) was the United States Secretary of State from 1961 to 1969 under presidents John F. Kennedy and Lyndon B. Johnson.

During the election campaign Lloyd George talked of “ guarantees ” and Asquith ( in his Albert Hall Speech, December 1909 ) of “ safeguards ” which would be necessary before forming another Liberal government, but in fact the King informed Asquith that he would not even be willing to contemplate creating peers until after a second General Election.

David Thomas " Davy " Jones ( 30 December 1945 – 29 February 2012 ) was an English recording artist, actor, and businessman, best known as a member of the musical group The Monkees and star of the TV series of the same name.

Heinrich Schliemann (; ( January 6, 1822 – December 26, 1890 ) was a German businessman and amateur archaeologist, and an advocate of the historical reality of places mentioned in the works of Homer.

Vicente Fox Quesada </ small > (; born July 2, 1942 ) is a Mexican businessman and politician who served as President of Mexico from 1 December 2000 to 30 November 2006 and currently serves as co-President of the Centrist Democrat International, an international organization of Christian democratic political parties.

* December 16 – J. Roderick MacArthur, American businessman and philanthropist ( b. 1920 )

* December 5 – Pattillo Higgins, oil pioneer and businessman, known as the " Prophet of Spindletop " ( d. 1955 )

* December 23 – James Roosevelt, American businessman and politician ( d. 1991 )

* December 25 – Glenn McCarthy, American oil tycoon and businessman ( d. 1988 )

* December 21 – J. Roderick MacArthur, American businessman and philanthropist ( d. 1984 )

* December 17 – Kerry Packer, Australian businessman ( d. 2005 )

* December 30 – Hans Niels Andersen, Danish businessman, founder of the East Asiatic Company ( b. 1852 )

* December 6 – Thaddeus C. Pound, American businessman and politician ( d. 1914 )

* December 29 – Titus Salt, British businessman and philanthropist ( b. 1803 )

* December 30 – Terrorist Carlos fails in his attempt to assassinate British businessman Joseph Sieff.

* December 10 – Sakamoto Ryōma, Japanese samurai, politician, and businessman ( b. 1836 )

* December 12 – John Wanamaker, American businessman ( b. 1838 )

* December 10 – Henry Wells, American businessman ( b. 1805 )

* December 30 – Asa Griggs Candler, American businessman and politician ( d. 1929 )

Andrew Stuart Fastow ( born December 22, 1961 ) is an American businessman who served as the chief financial officer of Enron Corporation that was based in Houston, Texas until the U. S. Securities and Exchange Commission opened an investigation into his and the company's conduct in 2001.

Jack Tramiel (, Trzmiel means " bumblebee "; December 13, 1928 – April 8, 2012 ) was a Polish-born American businessman, best known for founding Commodore International, the manufacturer of the Commodore PET, Commodore VIC-20, Commodore 64, Commodore 128, Amiga, and other Commodore models of home computers.

A German businessman and the chairman of the International Committee, John Rabe, boarded the U. S. gunboat Panay on December 9 and sent two telegrams, one to Chiang Kai-shek by way of the American ambassador in Hankow, and one to the Japanese military authority in Shanghai.

On December 6, 1987, an Israeli businessman was stabbed to death while shopping in Gaza.

* Arthur Godfrey Peuchen Lieutenant-Colonel ( April 18, 1859 – December 7, 1929 ) was a Canadian businessman and RMS Titanic survivor.

Green, who had run into financial problems stemming from his business ventures outside of hockey, was forced to sell the team to businessman Tom Hicks in December 1995.

On 23 December 2010, the consortium Bologna 2010 led by banker Giovanni Consorte and coffee businessman Massimo Zanetti acquired the club from Sergio Porcedda, after the latter failed to pay wages for the club during his short-tenured ownership and put Bologna in threaten of bankruptcy.