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) 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)
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, who approves on that day the Bases da Constituição
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