Pope John Paul II named him auxiliary bishop of the Archdiocese of Milan on 30 April 1981 and titular bishop of
Zallata. He received episcopal ordination on 6 June 1981 from Archbishop
Carlo Maria Martini, with Bishops
Libero Tresoldi and
Bernardo Citterio as co-consecrators. The same pope named him Bishop of Novara on 19 December 1990 to succeed
Aldo Del Monte, and he was installed on 3 March 1991. In November 2007, four months after
Pope Benedict XVI issued new rules about the use of the 1962
Roman Missal (see
Summorum Pontificum), three priests in the Novara diocese refused to celebrate Sunday Mass unless allowed to celebrate the
Tridentine Mass exclusively. Corti suspended them. While Bishop of Novara, he served terms as vice president of the
Italian Bishops Conference (2000 to 2005) and vice president of the Regional Bishops Conference of Piedmont. He also held assignments in the
Roman Curia as a member of the
Congregation for the Oriental Churches and the
Congregation for the Evangelization of Peoples. Pope Benedict XVI accepted his resignation as bishop of Novara on 24 November 2011. In retirement, he continued to lead spiritual exercises for both religious and lay groups. He lived at
Rho, near the college of the
Oblates of St. Ambrose and St. Charles. Corti was known for his work as a spiritual director. Pope John Paul II asked him to lead his
Lenten retreat in 2005, and at the invitation of Pope Francis, he wrote the meditations used at the
Stations of the Cross at Rome's
Colosseum in 2015. Pope Francis raised Corti to the rank of cardinal at a consistory held on 19 November 2016. He was given the rank of Cardinal-Priest and assigned the titular church of
San Giovanni a Porta Latina. ==Death==