A Select Library of the Nicene and Post-Nicene Fathers of the Christian Church, usually known as the Nicene and Post-Nicene Fathers (NPNF), is a set of books containing translations of early Christian writings into English. It was published between 1886 and 1900.

Philip Schaff was a Swiss-born, German-educated Protestant theologian and ecclesiastical historian, who spent most of his adult life living and teaching in the United States.