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← 1819 1818 1817 1820 in Chile → 1821 1822 1823
Decades:	1800s 1810s 1820s 1830s 1840s
See also:	Other events of 1820 Timeline of Chilean history

The following lists events that happened during 1820 in Chile.

Supreme Director of Chile: Bernardo O'Higgins

• 3-4 February - Capture of Valdivia
• 18 February - Battle of Agüi

• 6 March - Battle of El Toro

• 20 August - The Freedom Expedition of Perú sails for Paracas.

• 22 September - Battle of Pangal
• 26 September - Battle of Tarpellanca

• 25 November - Battle of Las Vegas de Talcahuano
• 27 November - Battle of Alameda de Concepcion

• Date unknown - Silvestre Ochagavía Errázuriz, deputy for Santiago
• 15 August - Jacinto Chacón, deputy for Santiago (died 1893) ^[1]

• 28 September - Pedro Andrés del Alcázar (born 1752)
• December - Pedro de Vivar (born 1742)