What was the difference between Pius XII’s policy of impartiality and neutrality during World War II?

During World War II, Pope Pius XII maintained that the Holy See followed a policy of impartiality rather than neutrality.1

The distinction was fundamental to his diplomatic strategy:

• Neutrality: Pius XII rejected this term because he associated it with moral indifference. He sought to avoid the perception that the papacy was unconcerned with the suffering caused by the conflict.1
• Impartiality: This policy was intended to keep the papacy "above the fray," allowing the Pope to serve as a potential mediator between nations and to protect the interests of the church. By remaining impartial, Pius XII aimed to avoid antagonizing totalitarian regimes, fearing that explicit condemnations would trigger reprisals against Catholics and jeopardize the church's future.12

Despite this stance, his actions were often interpreted differently by combatants; the Allies viewed his statements as inadequate, while Germany perceived him as an Allied sympathizer who had violated his own policy. Critics argue this approach amounted to silence in the face of evil, while defenders maintain it was a calculated effort to prevent greater harm and provide discreet humanitarian aid to victims of the war.312