(born at Lyon, France, 19 March 1807; died near Ceralvo, Mexico, 19 January 1847) was a French Jesuit academic, and U.S. Army chaplain during the Mexican–American War.
In 1840 he was sent to the United States, appointed professor of philosophy in Georgetown College, and in 1843 transferred to St. Joseph's Church in Philadelphia, Pennsylvania.
Fluent in French and German, Father Rey was able to preach in English three months after arriving in the United States.
He became assistant to the Jesuit provincial of Maryland, pastor of Trinity Church, Georgetown, and vice-president of the college (1845).
It is conjectured that he was killed by a band under the leader Antonio Canales Rosillo, as his body was discovered, pierced with lances, a few days later.