The Rev. Auguste Lemonnier, C.S.C. (April 12, 1839 – October 29, 1874) was a French-American Catholic priest, and fourth President of the University of Notre Dame from 1872 to 1874.The nephew of Rev. Edward Sorin, he traveled from France to Notre Dame in February 1861, where he completed his seminary studies and was ordained a priest on November 4, 1863. At Notre Dame, he was Prefect of Discipline (1863-1865), Prefect of Religion (1865-1866), and the President (1872-1874).