Pope Leo XIV Warns AI ‘Cannot Make War Morally Acceptable’: Vatican Releases Encyclical on Ethical Tech

The Vatican has released Pope Leo XIV’s first major encyclical, Magnifica Humanitas, which warns that artificial intelligence “cannot make war morally acceptable” and calls for global safeguards against its misuse. The document, published on May 25, 2026, marks a pivotal moment in Catholic social teaching and addresses one of the most pressing ethical challenges of the 21st century.

Encyclical Marks 135th Anniversary of Landmark Social Teaching

The encyclical was released on the 135th anniversary of Pope Leo XIII’s Rerum Novarum, the first modern Catholic social encyclical addressing labor rights during the Industrial Revolution. Like its predecessor, Magnifica Humanitas seeks to update the Church’s moral framework for a technological era, emphasizing the sanctity of human dignity in the face of rapid innovation.

“No algorithm can make war morally acceptable,” the Pope asserts, criticizing the dehumanizing potential of AI in military applications. The document condemns the “tight connection between economic interests, military apparatuses, and political decisions,” warning that AI risks concentrating power in the hands of a few.

Global Event at the Vatican: AI Ethics in Focus

A presentation event for the encyclical was held at the Vatican’s Synod Hall on May 25, 2026, with Pope Leo XIV in attendance. The gathering featured Cardinal Víctor Manuel Fernández, Prefect of the Dicastery for the Doctrine of the Faith, and Christopher Olah, co-founder of AI safety-focused company Anthropic. Olah’s presence highlights the Vatican’s engagement with tech industry leaders to address ethical concerns.

The Pope will deliver a final blessing at the event, breaking from tradition by speaking directly to the audience. The encyclical’s release coincides with growing global debates over AI regulation, particularly following U.S. Government actions targeting companies like Anthropic.

Key Themes: Human Dignity, AI Neutrality, and Military Risks

Magnifica Humanitas argues that AI is “not neutral,” a stance echoed by Vatican officials. The document warns that algorithmic decision-making in warfare reduces victims to “data points,” undermining moral accountability. It also criticizes the commercialization of AI, calling for international cooperation to prevent monopolies and ensure equitable access.

The encyclical draws parallels between the Industrial Revolution’s social upheaval and today’s AI-driven transformations. It emphasizes the need for “integral human development,” a concept central to the Church’s modern social doctrine. The text also addresses AI’s role in surveillance, employment, and privacy, urging policymakers to prioritize ethical considerations.

Context: Pope Leo XIV’s Background and Leadership Style

Elected as the 267th Pope on May 8, 2025, Leo XIV is a mathematician and canonist known for his analytical approach to complex issues. His encyclical reflects a blend of theological rigor and technical understanding, positioning him as a bridge between faith, and science. The document’s focus on AI aligns with his broader emphasis on “moral clarity in an age of uncertainty.”

The Vatican has described the encyclical as “lengthy and comprehensive,” with input from theologians, ethicists, and tech experts. Its release follows a series of Vatican-organized forums on AI ethics, including a 2024 conference on “AI and the Common Good.”

Implications for Global AI Governance

The encyclical’s critique of AI monopolies and militarization adds pressure on governments and corporations to adopt stricter regulations. It also challenges the Trump administration’s recent actions against Anthropic, which the Vatican has criticized as “disproportionate.” The document’s emphasis on human dignity may influence upcoming UN discussions on AI ethics.

Religious leaders worldwide have welcomed the encyclical, with some calling it a “moral compass” for tech development. However, critics argue that the Church’s influence on AI policy remains limited compared to corporate and governmental actors.

What’s Next: Implementation and Public Engagement

The Vatican has pledged to translate the encyclical into multiple languages and distribute it through diocesan networks. A follow-up symposium is planned for late 2026, focusing on implementing the document’s recommendations. The Church also aims to collaborate with tech firms on AI safety initiatives, though concrete partnerships remain under discussion.

Key Takeaways

• The Vatican’s Magnifica Humanitas warns AI cannot justify war and calls for global safeguards.
• The encyclical marks 135 years