Alexandre Lacauchie was a French engraver, lithographer, draftsman, and painter.

Alexandre Lacauchie was the son of Marie-Alexandre Lacauchie and Pauline-Angélique Depoilly, owner of the Café Flamand, a famous Parisian establishment founded in 1820, near the Porte Saint-Martin, the neighborhood where the young artist lived until at least 1835.

He participated in the Salons between 1833 and 1835, presenting a series of paintings, including portraits and landscapes, as well as pastels and drawings.

In April 1839, he married Rosalie-Pamela Poisson, and the couple lived at 25 boulevard Saint-Martin.

He is known to have published at least one lithographed album, Galerie des artistes dramatiques de Paris, in two volumes (Paris, 1840-1841), comprising 80 full-length portraits. Other lithographed drawings appeared under his name, including a portrait of Adelaïde Ristori (chez Godard, 1858).

He often worked with the engraver Henri-Jules Faxardo (1814-?). His full-length portraits of François-Séverin Marceau, François Paul de Brueys d'Aigalliers, and Jean-Baptiste Kléber were engraved by Eugène Leguay (1822–?) for the third volume of Albert Maurin's Galerie historique de la Révolution française (1787 to 1799).