By Father Soney Sebastian, SVD
World Mission Sunday 2026 holds a unique place in the life of the Church as Catholics around the world celebrate the 100th anniversary of World Mission Sunday, a global observance established by Pope Pius XI in 1926 at the request of the Society for the Propagation of the Faith.
For a century, this annual celebration has united the faithful in prayer, sacrifice and generosity for the Church’s missionary work, especially in areas where the Gospel is newly proclaimed and local Churches are still growing. This year, we shall celebrate it on the weekend of Oct. 17-18.
The theme chosen by Pope Leo XIV for this centennial celebration is “One in Christ, United in Mission.” In his message for the 100th World Mission Day, the Holy Father invites the Church to continue its missionary journey with renewed joy and zeal, emphasizing that authentic mission flows from our union with Christ and our communion with one another.
Pope Leo reminds us that the Church’s missionary vocation is not the responsibility of a few, but the calling of every baptized believer who shares in the Church’s mission of evangelization.
Reflecting on the Gospel prayer of Jesus “that they may all be one” (John 17:21), Pope Leo teaches that unity in Christ is both the source and fruit of mission. In a world often marked by division, conflict and isolation, Christians are called to become signs of reconciliation and hope, witnessing to the love of Christ through prayer, service and proclamation of the Gospel.
This centenary year is made even more meaningful by the beatification of Archbishop Fulton J. Sheen, one of the great missionary voices of the 20th century, on Sept. 24, 2026, in St. Louis, Missouri. This historic moment recognizes a life marked by heroic virtue and faithful service to the Gospel.
A gifted preacher, communicator and evangelizer, Archbishop Sheen dedicated much of his priestly and episcopal ministry to fostering missionary awareness. As national director of the Society for the Propagation of the Faith in the United States, he inspired countless Catholics to support the missions through prayer and generous giving.
Pope Leo recently praised Archbishop Sheen as a “light of faith, hope and love,” recalling the profound influence of his evangelizing witness.
Archbishop Sheen understood that missionary work extends far beyond distant lands. Through radio, television and his powerful preaching, he demonstrated that every Christian can be a missionary by bringing Christ into family life, public life and the culture of the day.
His witness resonates strongly with the theme of World Mission Sunday 2026. Like Pope Leo’s call to be “One in Christ, United in Mission,” Archbishop Sheen believed that a deep, personal relationship with Jesus naturally leads to sharing the Gospel with others.
As we mark 100 years of World Mission Sunday, we give thanks for the missionaries, clergy, religious, and lay faithful who have carried the Good News to every corner of the world. We also recognize our own responsibility in this mission. Through prayer, sacrifice and financial support, Catholics help sustain mission dioceses, seminaries, schools, healthcare ministries and countless evangelization efforts serving some of the world’s most vulnerable communities.
May this historic centennial celebration, illuminated by the example of the soon-to-be Blessed Fulton Sheen, inspire us to renew our commitment to Christ and his Church. United in faith and mission, may we answer the Lord’s call to be joyful missionary disciples and witnesses of hope to all peoples.
Father Soney Sebastian, SVD, is director of the Office for the Missions in the Diocese of San Diego.
