Historical events commemorated on October 25

October 25 marks several significant historical milestones across various regions and eras. In military history, the date recalls the Battle of Leyte Gulf during World War II, considered the largest naval battle in history, involving the Imperial Japanese Navy and the United States Navy in the Philippines. It also marks the 1917 Bolshevik Revolution in Russia, which led to the collapse of the Russian Empire and the rise of the Soviet Union.

In Europe, the date is associated with the 1147 Reconquista of Lisbon by Portuguese forces and English and Flemish crusaders. It also notes the 1415 Battle of Agincourt during the Hundred Years' War. In Greece, historical events include the 1822 siege of Missolonghi and the 1912 Greek fleet's occupation of Tenedos.

Other notable occurrences include the 1962 Nobel Prize in Literature being awarded to John Steinbeck, the founding of the French company Bic in 1945, and the 1983 US invasion of Grenada.