(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.

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.

[1] During his tenure as president and vice-president, Lemonnier strengthened the university's curriculum by adding more courses and faculty in math and the sciences.

He began construction of the university library (now Bond Hall), which was named in his honor.

[3] He died in office, at the young age of thirty five.