* 1801 – Joseph Lanner, Austrian composer and conductor ( d. 1843 )

* 1872 – William Frederick Horry, English convicted murderer ( b. 1843 )

* 1779 – Francis Scott Key, American lawyer, author, and songwriter ( d. 1843 )

* 1843 – Robert Todd Lincoln, American lawyer and politician, 35th United States Secretary of War ( d. 1926 )

* Haliotis semiplicata Menke, 1843 – the semiplicate abalone

* 1843 – The Cathedral of Our Lady of Peace in Honolulu, Hawaii is dedicated.

* 1843 – Tivoli Gardens, one of the oldest still intact amusement parks in the world, opens in Copenhagen, Denmark.

* 1774 – Robert Southey, English poet and biographer ( d. 1843 )

* 1843 – C. I. Scofield, American theologian, minister, and writer ( d. 1921 )

* 1843 – David B. Hill, American politician, 29th Governor of New York ( d. 1910 )

He validated his theory by converting carbon disulfide, in several steps, to acetic acid ( 1843 – 45 ).

* 1843 – Alice of the United Kingdom ( d. 1878 )

Work was also progressing on the northern half of the West Wing ( The Egyptian Sculpture Gallery ) 1826 – 1831, with Montagu House demolished in 1842 to make room for the final part of the West Wing, completed in 1846, and the South Wing with its great colonnade, initiated in 1843 and completed in 1847, when the Front Hall and Great Staircase were opened to the public.

* Charles Bill ( 1843 – 1915 ), British Conservative Party Member of Parliament ( MP ) Leek 1892 – 1906

#*** Charles Albert Edmond Bonaparte ( 1843 – 1847 )

Clausewitz, Hermann von Boyen ( 1771 – 1848 ) and Karl von Grolman ( 1777 – 1843 ) were Scharnhorst's primary allies in his efforts to reform the Prussian army between 1807 and 1814.

** Etty Darwin ( 1843 – 1929 ), daughter of Charles Darwin ( 1809 – 1882 )

* 1843 – Lydia Koidula, Estonian poet ( d. 1886 )

* 1843 – Robert Koch, German bacteriologist, Nobel laureate ( d. 1910 )

The Dominicans of the province of France furnished Lacordaire ( 1835 – 1836, 1843 – 1851 ), Jacques Monsabré ( 1869 – 1870, 1872 – 1890 ), Joseph Ollivier ( 1871, 1897 ), Thomas Etourneau ( 1898 – 1902 ).

This was overcome in 1843, when, with the help of William Le Lacheur, a Guernsey merchant and shipowner, a regular trade route was established.

* 1843 – Frederic William Henry Myers, English poet and essayist ( d. 1901 )

Adams sat for the earliest confirmed photograph still in existence of a U. S. president in 1843, although other sources contend that William Henry Harrison had posed even earlier for his portrait, in 1841.

* 1843 – Sir William Rowan Hamilton comes up with the idea of quaternions, a non-commutative extension of complex numbers.

* Smith ‏, William ( 1843 ).

William Miller predicted on the basis of and the " day-year principle " that Jesus Christ would return to Earth between the Spring of 1843 and the Spring of 1844.

The immediate predecessor of vectors were quaternions, devised by William Rowan Hamilton in 1843 as a generalization of complex numbers.

* William I of the Netherlands ( 1772 – 1843 )

William Jardine ( 24 February 1784 – 27 February 1843 ) was a Scottish physician and merchant.

The taipan, Dr. William Jardine died on 27 February 1843, just three days after his 59th birthday, one of the richest and most powerful men in Britain and a respected Member of Parliament.

William Abbot ( 12 June 1790 – 1 June 1843 ( age 53 )), was an English actor.

* September 14 – William McKinley, 25th President of the United States ( born 1843 )

* June 30 – William Henry Jackson, American photographer ( b. 1843 )

* September 30 – William Wilfred Sullivan, Canadian journalist, politician, and jurist ( b. 1843 )

* December 3 – William de Wiveleslie Abney, English astronomer and photographer ( b. 1843 )

* June 12 – William Abbot, English actor ( d. 1843 )

* August 24 – King William I of the Netherlands ( d. 1843 )

* September 23 – William Wallace, Scottish Mathematician ( d. 1843 )

William I Frederick, born Willem Frederik Prins van Oranje-Nassau ( 24 August 1772 – 12 December 1843 ), was a Prince of Orange and the first King of the Netherlands and Grand Duke of Luxembourg.

William died in 1843 in Berlin at the age of 71.

Frederic William Henry Myers ( 6 February 1843, Keswick, Cumberland – 17 January 1901, Rome ) was a poet, classicist, philologist, and a founder of the Society for Psychical Research.

In 1843, Aspdin's son William improved their cement, which was initially called " Patent Portland cement ", although he had no patent.

For a few months in 1843, he moved to the home of William Emerson on Staten Island, and tutored the family sons while seeking contacts among literary men and journalists in the city who might help publish his writings, including his future literary representative Horace Greeley.