The 1320s was the decade that started on January 1, 1320, and ended on December 31, 1329. It is distinct from the decade known as the 133th decade which began on January 1, 1321 and ended on December 31, 1330.

• In North America, after arriving in different areas in Mexico, the Aztec settle in a swampy area near Lake Texcoco, and found the city of Tenochtitlan.