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Pope Leo XIV speaks to students in the Paul VI Audience Hall at the Vatican Oct. 30, 2025, as part of the Jubilee of the World of Education. (CNS photo/Vatican Media)

Vatican announces theme for World Mission Sunday 2026

October 31, 2025
By Catholic News Service
Catholic News Service
Filed Under: Missions, News, World News

VATICAN CITY (CNS) — When the Catholic Church celebrates World Mission Sunday for the 100th time in 2026, it will focus on theme, “One in Christ, united in mission.”

The theme, chosen by Pope Leo XIV, is a reflection of his episcopal motto, “In Illo uno unum,” or literally “In the One, we are one.”

The Vatican announced Oct. 31 the theme for the 2026 observance, which will be celebrated Oct. 18. A papal message on the theme is expected in early February.

The theme “highlights the unity of believers in the faith, founded on the unity of Christ with the Father, and the consequent shared mission of evangelization,” the Vatican said.

For World Mission Sunday, Catholics around the globe spend time learning about the Catholic missions, pray in support of missionaries and make donations to support the work of the church in mission lands.

Ahead of the 2025 celebration, Pope Leo had issued a video explaining that “when I served as a missionary priest and then bishop in Peru, I saw first-hand how the faith, the prayer and the generosity shown on World Mission Sunday can transform entire communities.”

As an Augustinian priest, Pope Leo had served in the missions in Peru from 1985 to 1999 and then as apostolic administrator and later bishop of Chiclayo from 2014 to 2023.

Pope Pius XI instituted World Mission Sunday in 1926 to ensure that Catholics around the world shared responsibility for the missionary work of the church.

Pope Leo XIV to undergo surgery to remove lung nodule

Junno Arocho Esteves

October 11, 2026

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Pope Leo XIV announced that he will undergo surgery after doctors discovered a nodule, or lump, in his lungs.

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Continue Reading Pope Leo XIV to undergo surgery to remove lung nodule

Bishops discuss cohabitation of young couples at Vatican meeting on marriage and family

Courtney Mares

October 9, 2026

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On the third day of a weeklong Vatican meeting on marriage and family Oct. 9, Catholic bishops grappled with a trend that worries many Church leaders: young couples choosing to live together rather than wed.

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Irish sister brings front-line missionary perspective to Vatican curial role

Junno Arocho Esteves

October 9, 2026

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Continue Reading Irish sister brings front-line missionary perspective to Vatican curial role

Fostering critical thinking at Catholic universities can counter ‘false teachers,’ pope says

Carol Glatz

October 9, 2026

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Pursuing a higher education that values human intelligence can help counter the many “false teachers” exploiting people’s deep yearning for truth, faith and meaning, Pope Leo XIV said.

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Pope Leo to deliver peace message in Assisi 40 years after St. John Paul II’s landmark gathering

OSV News

October 9, 2026

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Forty years after St. John Paul II gathered leaders of the world’s religions in Assisi for a landmark day of prayer for peace, Pope Leo XIV will return to the city Oct. 27 for the closing day of the 2026 interreligious meeting.

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Pope Leo opens Vatican bishops’ meeting calling attention to the ‘fragility of families’

Courtney Mares

October 9, 2026

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Pope Leo XIV opened a Vatican meeting of the world’s bishops’ conference presidents and the heads of Eastern Catholic churches marking the 10th anniversary of “Amoris Laetitia” Oct. 7, saying “the beauty and fragility of families” today will be at the heart of the week’s discussions.

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