Infante João, Duke of Beja (Portuguese pronunciation: [ʒuˈɐ̃w]; English: John; 16 March 1842 – 27 December 1861) was a Portuguese infante (prince) and member of the House of Braganza.

[2] João received a military education and was a colonel of a cavalry regiment.

He was visiting England and France with his brother the Duke of Porto, heir presumptive to the throne, when they were summoned to return to Portugal by their brother King Pedro V who was dying of typhoid fever or cholera.

With his death the Duke of Porto became King Luís I and João became heir presumptive to the throne.

[3] He did not remain heir for long as he died a month later of the same illness that killed his brothers in Lisbon on 27 December 1861 aged 19 and unmarried.