Viscount of Barbacena () was a Portuguese noble title created by Dom Pedro, Prince Regent for Dom Afonso VI of Portugal, via a royal decree dated 19 December 1671, in favor of Afonso Furtado de Castro do Rio de Mendonça, 5th Lord of Barbacena and Governor-general of Brazil.
Titleholders Afonso Furtado de Castro do Rio de Mendonça (1671-1675), 5th Lord and 1st Viscount of Barbacena; Jorge Furtado de Mendonça (1675-1708), 2nd Viscount of Barbacena; Afonso Furtado de Mendonça (1708-?), 3rd Viscount of Barbacena; Luís Xavier Furtado de Mendonça (?-?), 4th Viscount of Barbacena; Francisco Vicente Xavier Furtado de Castro do Rio de Mendonça (?-1790), 5th Viscount of Barbacena; Luís António Furtado de Castro do Rio de Mendonça e Faro (1790-1830), 6th Viscount and 1st Count of Barbacena; Francisco Furtado de Castro do Rio de Mendonça (1830-1854), 7th Viscount and 2nd Count of Barbacena.
The 2nd Count of Barbacena, who left no descendants, was the last holder of the title, which has since remained vacant.
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