These pages offer a new edition of Yves Congar's A History of Theology, which was originally published in the 1960s. This work began as a lengthy article appearing in the multi-volume Dictionnaire de Thologie in 1946 entitled 'Thologie'. Congar wrote that he, Fr M-D Chenu OP, and Fr Henri-Marie Fret OP in the 1930s planned a book of this type.