1833

1833 (MDCCCXXXIII) was a common year starting on Tuesday of the Gregorian calendar and a common year starting on Sunday of the Julian calendar, the 1833rd year of the Common Era (CE) and Anno Domini (AD) designations, the 833rd year of the 2nd millennium, the 33rd year of the 19th century, and the 4th year of the 1830s decade. As of the start of 1833, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.

• January 3 – Britain invades the Falkland Islands in the South Atlantic.
• March 2 – United States President Andrew Jackson signs the Force Act, which authorizes him to use troops to enforce federal law in South Carolina.
• March 4 – Ayya Vaikundar incarnated from the sea of Thiruchendur as the avatar of Kali Yukam.
• June 6 – U.S. President Jackson becomes the first President to ride a train.
• May 11 – French-American farmhand Antoine le Blanc murders family of three.
• September 29 – The infant Isabella II becomes Queen of Spain, under the regency of her mother, Maria Cristina of Bourbon-Two Sicilies. Her uncle Don Carlos, Conde de Molina challenges her claim, beginning the First Carlist War.
• December 14 – The assassination of Kaspar Hauser, who dies three days later on December 17.
• Charles Babbage described his analytical engine. (see also history of computing hardware)
• The dawn of biochemistry: discovery of the first enzyme, diastase, by Anselme Payen.
• The British Parliament passes the Slavery Abolition Act giving all slaves in the British Empire their freedom.
• Heard Island and the McDonald Islands discovered.