OCIA/OCIC or Order of Christian Initiation for Adults/Order of Christian Initiation for Children is the process of becoming a Catholic. It begins with extended evangelization (forming a relationship with Jesus Christ), catechesis (learning about the faith), and spiritual formation (deepening of faith) in the Roman Catholic Church.

Traditionally the OCIA process begins in the Fall, when Faith Formation classes begin, and continues through out Lent ending at the Easter Vigil on Holy Saturday when the candidate stands before the Parish and declares their desire to become Catholic. They are then Baptized, receive First Holy Communion and Confirmation becoming a fully initiated member of the Roman Catholic Faith.