Jérôme Lalemant, S.J. (Paris, April 27, 1593 – Quebec City, January 26, 1673) was a French Jesuit priest who was a leader of the Jesuit mission in New France.
Lalemant entered the Jesuit novitiate in Paris on 20 October 1610, after which he studied philosophy at Pont-à-Mousson (1612–15) and theology at the Collège de Clermont (1619–23). In the following interval, while he fulfilled his period of regency, he served as a prefect of the Jesuit boarding school at Verdun (1615–16) and teacher at the Collège in Amiens (1616–19). After finishing his study of theology he taught philosophy and the sciences at the Collège de Clermont (1623–26), and did his tertianship, a third probationary year of the Society of Jesus, at Rouen (1626–27), after which he was allowed to profess the fourth vow specific to the Society of Jesus.
Following the completion of his formation period, Lalement became the chaplain of the Collège de Clermont (1627–29) and head of the boarding school of this same college (1629–32), and then Rector of the college in Blois (1632–36). From 1636 to 1638 he was again at the Collège de Clermont, this time as chaplain. Few Jesuits had had as wide experience as Lalemant before he was allowed to go to Canada, an evidence of the high esteem in which he was held by his superiors.
Lalement was almost immediately made Superior for the mission to the Hurons, succeeding Jean de Brébeuf, and in 1639 founded Sainte-Marie-des-Hurons which was the central residence of the missionaries in the field. The mission was located just south of Georgian Bay on Lake Huron and near modern-day Midland, Ontario.