Welcome to the Knights of Columbus, the world’s largest lay Catholic family service organization. As their forebears did more than a century ago, today’s Knights and their families stand shoulder to shoulder in support of one another. Through their charity and the examples of their lives, they stand in service to all as witnesses to the Good News of the Gospel. Membership in the Knights of Columbus is open to any practical Catholic man in union with the Holy See who is not less than 18 years of age on his last birthday. A practical Catholic is one who lives up to the Commandments of God and the Precepts of the Church.