Pope Leo XIV has chosen “One in Christ, United in Mission” to be the theme for World Mission Sunday 2026, which will mark the 100th anniversary since the establishment of the day by Pope Pius XI. Source: Catholic Mission.
The centenary celebration will be held on October 18, 2026, as a moment of gratitude and reflection for missionaries around the world, highlighting the Universal Church’s enduring commitment to support the life-giving work of mission.
Pope Leo highlights the importance of unity in Christ as the foundation of our missionary calling.
“The theme of World Mission Day 2026, which in its first part recalls the motto chosen by the Holy Father for his Pontificate, In Illo uno unum, recalls the unity of believers in faith, based on the unity with Christ con the Father, and the consequent common mission of evangelisation,” the Dicastery for Evangelisation said in its announcement.
“During 2025, guided by the theme Missionaries of Hope among all peoples, we have walked alongside many communities, especially those in the Mpika Diocese, Zambia,” Peter Gates, Catholic Mission’s Deputy National Director, said.
“We have witnessed the power of hope at work, sharing in the joys, struggles, and aspirations of the people. Together, we have built bonds of trust, resilience, and faith, fostering shared growth. As this journey continues, Missionaries of Hope among all peoples becomes beautifully intertwined with One in Christ, United in Mission, reminding us that true mission begins when hearts meet and hope is shared.”
The Dicastery’s official message said that the first step in the preparation of World Mission Day 2026 would be the dissemination, in the first months of the year, of the Holy Father’s message.
“This will become the guiding thread of the many initiatives of animation and formation in the spirit and of missionary responsibility in all the faithful throughout this significant year.”
Catholic Mission invited all communities across Australia to join in prayer, reflection, and action in preparation for the milestone celebration.
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Pope Leo XIV announces the 2026 World Mission Sunday theme: “One in Christ, United in Mission.” (Catholic Mission)
