Réginald Marie Garrigou-Lagrange (French: [gaʁigu lagʁɑ̃ʒ]; 21 February 1877 – 15 February 1964) was a French Dominican friar, philosopher and theologian. Garrigou-Lagrange was a neo-Thomist theologian, recognized along with Édouard Hugon and Martin Grabmann as distinguished theologians of the 20th century. As professor at the Pontifical University of Saint Thomas Aquinas, he taught dogmatic and spiritual theology in Rome from 1909 to 1959. There he wrote The Three Ages of the Interior Life (Les trois âges de la vie intérieure) in 1938.
