Lucien Ambroise Hénault (Bazoches-en-Dunois, 30 January 1823 - Paris, 30 January 1908) was a French architect and academic, noted for building and designing several of the main buildings in Santiago de Chile in the mid-19th century.

Between 1844 and 1853 he studied at the Paris School of Fine Arts (École nationale supérieure des beaux-arts), at which he was an outstanding pupil, earning a medal for his project for a villa at Choisy in 1852.

[2] He was contracted by the Government of Chile on 31 October 1856, through his plenipotentiary minister in France, Manuel Blanco Encalada, to take over as official architect of the government after the death of fellow Frenchman François Brunet de Baines in 1855.

In 1857 he was commissioned to design the Central House of the University of Chile, which Fermín Vivaceta began to build in 1863.

[2] In Paris he married twice: the first with Marie Louise Isaline Marguin, on 8 January 1878; the second on 4 March 1893, with Marcelle Polo.