Lucien Henri Louis Brun (2 June 1822 – 28 November 1898) was a French politician.
Brun was born in Gex, Ain, on 2 June 1822.
After graduating from the Faculty of Law of Paris, Brun practiced law in Lyon until his 1871 election to the National Assembly as a deputy from Ain.
Brun won over 40,000 votes and was the sixth of seven Ain-based deputies to be seated.
He died on 28 November 1898, and was replaced by Athanase Bassinet.