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1821 was a year in the Gregorian calendar that marked significant historical developments, including Mexican independence from Spain and the founding of McGill University in Montreal. It remains a reference point for understanding early 19th-century political and cultural changes in the Americas and beyond.
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March 25 (April 6 in the Julian calendar): Germanos of Patras declares the independence of Greece from the Ottoman Empire to start the Greek War of Independence.
1821 (MDCCCXXI) was a common year starting on Monday of the Gregorian calendar and a common year starting on Saturday of the Julian calendar, the 1821st year of the Common Era (CE) and Anno Domini (AD) designations, the 821st year of the 2nd millennium, the 21st year of the 19th century, and the 2nd year of the 1820s decade. As of the start of 1821, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.