The Couple to Couple League (CCL) is an international Catholic 501(c)(3) non-profit organization with an interfaith mission: to build joyful marriages by teaching Natural Family Planning (NFP), couple to couple. Our mission arose from the prophetic call of Saint Pope Paul VI in Humanae Vitae to help “married couples themselves…become apostles and guides to other married couples…” (HV 26). Heeding the pope’s words that the Church “has a constant need of being evangelized,” and that people listen “more willingly to witnesses than to teachers,” CCL brings the scientific knowledge of modern NFP to engaged and married couples wrapped in the beautiful context of the witness of teaching couples who themselves have experienced the graces of the truth of God’s plan for marital love. Our modern, engaging and comprehensive instructional program and ongoing support provides couples with the practical knowledge they need to live out their call to responsible parenthood, and thus opening their hearts to hear God’s call for their marriage.