1803 1804 1805 - 1806 - 1807 1808 1809
1770s 1780s 1790s - 1800s - 1810s 1820s 1830s
Events of 1806
- January 1 – Kingdom of Bavaria established by Napoleon
- January 8 – Cape Colony becomes a British colony.
- January 10 – The Dutch in Cape Town surrender to the British.
- January 19 – The British occupy the Cape of Good Hope.
- January 23 – Grenville succeeds William Pitt the Younger as wartime Prime Minister of the United Kingdom, upon Pitt's death this day amidst worsening health caused by the stresses of the Napoleonic Wars
- February 6 – The Royal Navy gains a victory off Santo Domingo (see Action of 6 February 1806).
- March 23 – After traveling through the Louisiana Purchase and reaching the Pacific Ocean, explorers Lewis and Clark and their Corps of Discovery begin their journey home.
- March 29 – Construction is authorized of the National Road (the first United States federal highway).
- April 8 – Stephanie de Beauharnais, adopted daughter of Napoleon Bonaparte, marries Prince Karl Ludwig Friedrich of Baden.
- May 30 – Andrew Jackson kills a man in a duel after the man had accused Jackson's wife of bigamy.
- June 5 – Louis Bonaparte is appointed as King of Holland by his brother, Emperor Napoleon I.
- July 4 – Battle of Maida: Britain defeats France in Calabria.
- July 10 – Vellore Mutiny (the first mutiny by Indian sepoys against the British East India Company).
- July 15 – Pike expedition: Near St. Louis, Missouri, United States Army Lieutenant Zebulon Pike leads an expedition from Fort Belle Fountaine to explore the west.
- August 6 – Francis II, the last Holy Roman Emperor, abdicates, thus ending the Holy Roman Empire.
- September – Prussia declares war on France, and is joined by Saxony and other minor German states.
- September 23 – The Lewis and Clark Expedition reaches St. Louis, Missouri, ending a successful exploration of the Louisiana Territory and the Pacific Northwest.
- October 14 – Battle of Jena-Auerstädt: Napoleon defeats the Prussian army of Prince Hohenlohe at Jena while Marshal Davout defeats the main Prussian army under the Duke of Brunswick, who is killed.
- October 19 – Emperor Jacques I of Haiti (Jean-Jacques Dessalines) is assassinated at the Pont-Rouge Haiti.
- October 24 – French forces enter Berlin.
- November – Napoleon declares a Continental Blockade against the British.
- November 15 – Pike expedition: During his second exploratory expedition, Lieutenant Zebulon Pike sees a distant mountain peak while near the Colorado foothills of the Rocky Mountains (later named Pikes Peak in his honor).
- November 24 – The last major Prussian field force, under Gebhard Leberecht von Blücher, surrenders to the French near Lübeck. Frederick William III has by this time fled to Russia.
- November 30 – Napoleon captures Warsaw.
- December 26 – 1806 Battles of Pultusk and Golymin. Battle of Pultusk: Russian forces under General Bennigsen narrowly escape from a direct confrontation with Napoleon, who goes into winter quarters. Battle of Golymin: Russian forces under General Golitsyn fight a successful rearguard action against French forces under Marshall Murat.