← 1820 1819 1818 1821 in Portugal → 1822 1823 1824
Centuries:	17th 18th 19th 20th 21st
Decades:	1800s 1810s 1820s 1830s 1840s
See also:	List of years in Portugal

Events in the year 1821 in Portugal.

Incumbents

• Monarch: John VI
  • President of the Regency: Manuel António de Sampaio Melo e Castro Moniz Torres de Lusignan (from January)^[1]
• Minister of the Kingdom: Inácio da Costa Quintela (from 4 July to 7 September), Francisco Duarte Coelho (interim, from 14 August to 7 September), Filipe Ferreira de Araújo e Castro (from 7 September), José da Silva Carvalho (interim, from 7 September to 8 October)^[1]

Events

• January - General Extraordinary and Constituent Courts of the Portuguese Nation
• Cortes Gerais e Extraordinárias da Nação Portuguesa drafts the basis for a new constitution, proposes the closure of Portuguese Inquisition
• July 4 - Return of John VI from Brazil,^[1] who approves on that day the Bases da Constituição