Communion and Liberation (Italian: Comunione e Liberazione, often shortened to CL), since 1980 officially Fraternity of Communion and Liberation (Italian: Fraternità di Comunione e Liberazione), it is an international Catholic movement founded in 1954 by Fr. Luigi Giussani as Student Youth (Gioventù Studentesca), with the aim of presenting the Christian event in a way which is in tune with contemporary culture, making it a source of new values for the modern world. The movement is in ninety countries on nearly every continent.

The name "Communion and Liberation" first appeared in 1969, and it synthesizes the conviction that the Christian event, lived in "communion" is the foundation of man's authentic "liberation".

Communion and Liberation's origin is in the educational and catechetical methods of Luigi Giussani who in 1954, abandoned his teaching position at the Venegono seminary to teach Catholic religion at Berchet High School [it] in Milan. Following daily encounters with his students, Giussani soon became an assistant to Catholic Action via the Gioventù Studentesca (Student Youth) branch. Within a few years, GS widely spread within and well beyond the Milanese diocese.

Though GS was part of Catholic Action, differences in approach caused internal tension and an eventual schism. In 1968, various members abandoned the group. The ones who remained faithful to Giussani organized themselves in what they eventually named "Communion and Liberation." The name was derived from a flyer distributed by some university students in 1969 with the aim to respond to the time's common mentality. While the world affirmed that man's freedom rested in revolution, they believed Christian communion was liberation.

Giussani said that he never planned to found a Catholic movement. In a letter to Pope John Paul II, he wrote, "Not only did I never intent to 'found' anything, but I believe that the genius of the movement whose birth I witnessed was the perceived urgency to proclaim the need to return to the elementary aspects of Christianity. That is a passion for the Christian fact as such, in its original elements. That's it." The pope was said to have been an ardent advocate of the movement, maintaining that it is a vanguard in "the work of overcoming the division between the Gospel and Culture". John Paul II also supported the work of the Italian politician Rocco Buttiglione, a member of the Communion and Liberation, particularly those that confirmed his European and American views. The pope's attitude was influenced by his papacy's focus on moral issues as well as the movement's anti-liberal orientation.

Giussani's former high school and university students began to express their desire to live the experience of the movement in a more stable way. Their desire was fulfilled on February 11, 1982, when the Fraternity of Communion and Liberation was recognized by the Pontifical Council for the Laity as a lay association of pontifical rights.

After Giussani's death on February 22, 2005, responsibility over Communion and Liberation was passed on to Spanish priest and theologian Julián Carrón, who resigned in 2021 and was succeeded by Davide Prosperi.

The experience of life proposed by Communion and Liberation revolves around what Giussani considered to be the dimensions of Christian life: culture, charity, and mission. CL continues to be represented in secondary schools under the name of GS, while Communion and Liberation - University (CLU) informally encompasses the university students involved. Different forms of consecrated life are also present in the movement: Memores Domini, the Fraternity of St. Joseph, the Priestly Fraternity of St. Charles Borromeo, and the Sisters of Charity of the Assumption.