L
- Saint Jean de Lalande, North American martyr
- Saint Gabriel Lalemant, North American martyr
- Brendan Lally, American; Famous spiritual director at the Pontifical North American College and Saint Joseph's University
- Stephen Francis Latchford, American; spiritual leader and industrial relations expert.
- Georges LeMaitre, Belgian physicist; one of the originators of the "Big Bang" theory
- Leonardus Lessius, Belgian moral theologian and writer on economics
- Léon Degrelle, Belgian Soldier
- Saint David Lewis, Welsh martyr
- Constant Lievens, the Apostle of Chotanagpur, a Flemish Jesuit who worked among the Adivasis of Central India
- Segundo Llorente, Spanish-born priest in rural western Alaska; was elected by write-in vote to the Alaska House of Representatives in 1960 by residents of the Wade Hampton district, becoming the first Catholic priest to serve in a U.S. state legislature
- Bernard Lonergan, Canadian philosopher and theologian, Companion of the Order of Canada
- Saint Ignatius of Loyola, founder and first Superior General of the Society of Jesus
- Cardinal Henri de Lubac, French theologian, and patrologist
Read more about this topic: List Of Jesuits