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The year 1820 in archaeology involved some significant events.
Excavations
- First excavations of the Gallo-Roman site at Grand, Vosges.
Publications
thumb|[[Venus de Milo (Musée du Louvre, Paris)]]
- Narrative of the Operations and Recent Discoveries Within the Pyramids, Temples, Tombs, and Excavations in Egypt and Nubia by Giovanni Battista Belzoni.
- First volume of the American Antiquarian Society's Transactions. Includes map and descriptions of Mound Builders remains in Ohio by Caleb Atwater.
Finds
- April 8 - Venus de Milo (Aphrodite of Milos, c.150 BC-125 BC) is discovered on the island of Milos by a peasant named Yorgos Kentrotas.
- Statue of Ramesses II is discovered at the Great Temple of Ptah of Mit-Rahina near Memphis, Egypt by Giovanni Battista Caviglia.
Births
- March 23 - Canon William Greenwell, English archaeologist notable for his Grimes Graves excavations (died 1918).