Saint Jean-Baptiste de La Salle or John Baptist de La Salle (30 April 1651 – 7 April 1719) was a priest, educational reformer, and founder of Institute of the Brothers of the Christian Schools. He is a saint of the Roman Catholic church, and the patron saint of teachers.

He dedicated much of his life for the education of poor children of France, and in doing so, started many lasting educational practices in France. Many other people today follow in the path of education created by Saint John Baptiste de La Salle. He is considered the founder of the first Catholic schools.

Born in Reims, France, John-Baptiste de La Salle received the tonsure at age eleven and was named canon of Rheims Cathedral when he was sixteen. Though he had to assume the administration of family affairs after his parents died, he completed his theological studies and was ordained to the priesthood at the age of 26 on April 9, 1678. Two years later he received a Doctorate in Theology.

De La Salle became involved in education little by little, without ever consciously setting out to do so. In 1679, what began as a charitable effort to help Adrian Nyel establish a school for the poor in De La Salle's home town gradually became his life's work. He thereby began a new order, the Institute of the Brothers of the Christian Schools, also known as the De La Salle Brothers (in the U.K., Ireland, Australasia and Asia) or, most commonly in the United States, the Christian Brothers. They are sometimes confused with a different congregation of the same name founded by Blessed Edmund Ignatius Rice in Ireland, who are known in the U.S. as the Irish Christian Brothers. In his own words, one decision led to another until he found himself doing something that he had never anticipated. De La Salle wrote:

At that time, most children had little hope for the future. Moved by the plight of the poor who seemed so "far from salvation" either in this world or the next, he determined to put his own talents and advanced education at the service of the children "often left to themselves and badly brought up." To be more effective, he abandoned his family home, moved in with the teachers, renounced his position as Canon and his wealth, and so formed a new community of lay religious teachers. The De La Salle Brothers were the first Roman Catholic religious teaching order that didn't include any priests.

His enterprise met opposition from the ecclesiastical authorities who resisted the creation of a new form of religious life, a community of consecrated laymen to conduct free schools "together and by association." The educational establishment resented his innovative methods and his insistence on gratuity for all, regardless of whether they could afford to pay. Nevertheless, De La Salle and his Brothers succeeded in creating a network of quality schools throughout France that featured instruction in the vernacular, students grouped according to ability and achievement, integration of religious instruction with secular subjects, well prepared teachers with a sense of vocation and mission, and the involvement of parents.

De La Salle was a pioneer in programs for training lay teachers. In 1685, he founded what is generally considered the first normal school — that is, a school whose purpose is to train teachers — in Rheims, France. He was a pedagogical thinker of note and is among the founders of a distinctively modern pedagogy. His educational innovations include Sunday courses for working young men, one of the first institutions in France for the care of delinquents, technical schools, and, secondary schools for modern languages, arts, and sciences. Worn out by austerities and exhausting labors, he died at Saint Yon near Rouen early in 1719 on Good Friday, only weeks before his 68th birthday.

De La Salle’s work quickly spread through France and, after his death, continued to spread across the globe. He was canonized by Pope Leo XIII on May 24, 1900 and was inserted in the Roman Catholic calendar of saints in 1904. Because of his life and inspirational writings, he was proclaimed as the Patron Saint of Teachers on May 15, 1950, by Pope Pius XII. Since 1970, his feast is celebrated in the Catholic Church calendar on April 7, but at La Sallian institutions, and in communities that follow a pre-1970 (but post 1904) calendar, on May 15.

Currently, about 6,000 Brothers and 75,000 lay and religious colleagues worldwide serve as teachers, counselors and guides to 900,000 students in over 1,000 educational institutions in 84 countries.

There is a street named after La Salle in Bangkok, Thailand: Soi Sukhumvit 105. It got this name due to a La Salle school on this street. As well as the street in Thailand, there is a street in St. Louis, Missouri, US, named De La Salle Avenue named after the saint due to its nearness to another Christian Brothers School.