1804 United States presidential election — 5th quadrennial U.S. presidential election

Haitian Revolution — 1791 slave revolt in the French colony of Saint-Domingue

Civil Code of the French — civil code of 1804

Serbian Revolution — early 19th century events in the history of Serbia

1804 minor naval engagement of the Napoleonic Wars

1804 battle of the First Serbian Uprising

1804 battle between Serbia and the Ottoman Empire

Battle in the Fulani War

1804 minor naval engagement fought in the approaches to Vizagapatam harbour in the Coastal Andhra region of British India on the Bay of Bengal

1804 battle that Russia faces the Alaskan natives

1804 treaty between the United States and representatives of the Sauk and Meskwaki peoples