Mariano de la Bárcena (July 22, 1842[1] – April 10, 1899) was a Mexican engineer, botanist, politician, and interim Governor of Jalisco.

[2] Mariano Santiago de Jesús de la Bárcena y Ramos was born to Don José María de la Bárcena y Villaseñor of Ameca and his third wife Doña María Candelaria Ramos y Célis of Zacoalco.

From early youth he devoted himself to study and research in natural sciences.

Bárcena is a member of several European and American scientific associations, and was director of the meteorological observatory of Mexico.

He discovered and classified many Mexican plants, and published a book on the natural products of the state of Jalisco, and a treatise on geology.