1825

Events 
January 4 – King Ferdinand I of the Two Sicilies dies and is succeeded by his son Francis I of the Two Sicilies.
 February 12 – The Creek cede the last of their lands in Georgia to the United States government, and migrate west
March 4 – John Quincy Adams officially succeeds James Monroe as President of the United States.
 July 6 – The Duke of Schleswig-Holstein-Sønderborg-Beck gains possession of Glücksburg and changes his title to Friedrich Wilhelm, Duke of Schleswig-Holstein-Sonderburg-Glücksburg. The line of Schleswig-Holstein-Sonderburg-Glücksburg later became the Royal House of Greece, Denmark and Norway.
 July 30 – Malden Island (an uninhabited island in the central Pacific Ocean) discovered. 
 August 6 – Bolivia gains independence from Peru as a republic with the instigation of Simón Bolívar
 August 25 – Uruguay declares independence from Brazil (See Uruguay's independence)
 September 27 – The world's first modern railway, the Stockton and Darlington Railway opens in England.
 October 26 – The Erie Canal opens – passage from Albany, New York to Lake Erie
 December 1 – Nicholas I of Russia succeeds his older brother Alexander I.
 Decembrist Revolt in Russia.
 The first horse-drawn omnibuses established in London
 First roller skates
 Aluminium discovered
 City of Brisbane founded – see History of Brisbane
 The electromagnet was invented by William Sturgeon

Deaths
 May 2 – Michail Leontievich Bulatov, Russian military