Infante Francisco, Duke of Beja[1] (Portuguese pronunciation: [fɾɐ̃ˈsiʃku]) (Lisbon, 25 May 1691 – Lisbon, 21 July 1742) was a Portuguese infante (prince) son of Peter II, King of Portugal, and his second wife, Maria Sofia of the Palatinate.

Francisco Xavier José António Bento Urbano was born on 25 May 1691 in Lisbon.

Responding to a request by Pope Clement XI to aid in the fight against the Turks, in 1716, King John V of Portugal (Infante Francisco's brother) sent a fleet of Portuguese ships to aid Venice and Austria in their fights against the Turks, led by the Count of Rio Grande, the Count of São Vicente and by the Duke of Beja.

[2] He died unmarried and without legitimate issue on 21 July 1742 at the Quinta das Gaeiras in Óbidos.

He had two natural children with Mariana Silveira, a nun, who died during the 1755 Lisbon earthquake: This biography of a member of the Portuguese royal family is a stub.