Thomas-Joseph Bouquillon[7] (French pronunciation: [tɔmɑ bukijɔ̃]; 16 May 1840 – 5 November 1902) was a Belgian Catholic theologian, priest and professor.

[11] In 1892 he accepted the Chair of Moral Theology at the Catholic University of America in Washington DC, where he remained until his death on November 5, 1902, in Brussels, Belgium.

[11] In his whole career as a professor and author Bouquillon aimed to revive moral theology from its poor academic condition and to restore proper method and dignity in the field.

[11] He retained the intimate confidence of Pope Leo XIII and other eminent churchmen, and showed devotion to the ideals, teaching, and administration of the Roman Catholic Church throughout his life.

[14] In all of his published replies to critics, he maintained his original positions without any modification and ascribed the opposition to the misunderstanding of his statement of principles.