19th Century (1801–1900)

1801 — year

Treaty of Lunéville — 1801 Treaty during the War of the Second Coalition

Young's interference experiment — 1801 double-slit optical experiment by Thomas Young

1801 treaty between France and Russia

treaty signed in 1801 between John VI of Portugal and representatives from the French Republic

1801 treaty between France and Spain

1801 treaty between Great Britain and Persia

1801 treaty between the United States and Choctaw

1801 second battle of the French campaign in Egypt and Syria to be fought at Abu Qir

1801 battle during the French Campaign in Egypt and Syria

Battle of Ujjain

1801 battle during the French Campaign in Egypt and Syria

war between Ottoman and French army's

1801 siege during the French Campaign in Egypt and Syria

battle between British and Dano–Norwegian navies (1801)

1801 naval battle of the First Barbary War

1801 minor naval engagement during the French Revolutionary Wars

1801 minor naval engagement during the French Revolutionary Wars

1801 naval battle during the War of the Second Coalition

1801 naval battle