Celebrating a Century of Mission and Unity

As we mark 100 years of World Mission Sunday, the Church gathers in a spirit of unity, prayer, and generosity. Across continents, communities come together to celebrate a shared calling that transcends borders, languages, and cultures – a living expression of a Church united in Christ and sent forth in mission.

Chosen by Pope Leo XIV, the theme for World Mission Sunday 2026 has been announced as ‘One in Christ, united in mission’. It invites us to be rooted in unity with Christ and with one another, and calls us to walk together as sisters and brothers, bringing hope, compassion and the Good News to communities near and far.

Catholic Mission invites communities across Australia to join in with open hearts, united in faith and mission, as we journey together towards World Mission Sunday on 18 October 2026.

In his announcement of this year's World Mission Month theme, Pope Leo XIV highlighted 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."

As one body in Christ, we are called to journey together, to listen, to serve, and to share the love that transforms hearts and communities. Whether near or far, each act of faith and generosity strengthens our communion and reveals the face of Christ among us.

“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,” shared Peter Gates, Deputy National Director. “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.”

Generations of missionaries have walked alongside communities, not only proclaiming the Gospel but building schools, supporting healthcare, and fostering hope in the most challenging circumstances. Their presence has helped shape vibrant, self-sustaining local Churches, where faith is lived, shared and carried forward by the communities themselves.