Francis Bruen (died 15 December 1867) was an Irish Conservative Party politician. He was Member of Parliament (MP) for Carlow Borough from 1835 to 1837, and briefly in 1839, taking his seat in the House of Commons of what was then the United Kingdom of Great Britain and Ireland.
Bruen first stood for Parliament at the 1832 general election, in Carlow Borough, but did not win the seat. He was successful on his second attempt in 1835, when he defeated Nicholas Vigors, Carlow's Liberal Repealer MP. At the 1837 general election, he was defeated by another Liberal, William Henry Maule. In 1839, Maule was appointed as a Baron of the Court of the Exchequer (a type of judge), and on 27 February 1839, Bruen won the resulting by-election by 167 votes to 164. However, the result was overturned after an electoral petition, and the result was amended to 159 votes for Bruen and 160 for his Liberal opponent, Thomas Gisborne. He did not stand again.
Francis was the sixth and youngest child of Colonel Henry Bruen (1741–1795) and his wife Dorothea Henrietta Knox. (His date of birth is listed in one source as 1800, but it seem seems improbable that he was born five years after the death of his father, which is listed by Rayment as 14 December 1795.) In 1823, Francis married Catherine Anne Nugent, daughter of George Nugent, the 7th Earl of Westmeath and Lady Elizabeth Emily Moore. They had no children.