The Mantle of João VI, also known as the Mantle of the United Kingdom of Portugal, Brazil, and the Algarves (Portuguese: Manto de João VI; Manto do Reino Unido de Portugal, do Brasil, e dos Algarves), is the royal robe, a part of the Portuguese Crown Jewels, that was fashioned for the acclamation of King João VI, alongside the Crown of João VI and the Sceptre of the Armillary.
The Mantle of João VI was created for the acclamation of João VI as King. It was fashioned in Portugal, even though João VI was in Brazil, for Portugal was encaged in the Peninsular War. The robe was only used only by João VI.
The mantle was made in Portugal for João VI's acclamation. It is fashioned out of velvet, silk, ermine, wire rod, sequins, and various precious jewels. The design of the robe bears several symbols of the United Kingdom of Portugal, Brazil, and the Algarves, for which João VI was monarch of during João VI's stay in Brazil.