Father Oscar Lukefahr, C.M. (July 20, 1939 – August 10, 2015) was an American Catholic priest, theologian, writer, and Christian apologist. He is best known as the author of many introductory books and tracts on the subject of Catholicism, operating the from the Archdiocese of St. Louis. This service distributes free Catholic literature to thousands of RCIA students each year.