Quadragesimo anno

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Quadragesimo anno Latin for 'In the 40th Year' Encyclical of Pope Pius XI
Signature date	15 May 1931
Subject	On the reconstruction of the social order
Number	19 of 31 of the pontificate
Text	In Latin In English
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Part of a series on
Catholic social teaching
Emblem of the Holy See
Overview
Social teachings of the papacy Distributism Solidarity Subsidiarity Tranquillitas ordinis
Pope Leo XIII Rerum novarum
Pope Pius XI Divini redemptoris Mit brennender Sorge Non abbiamo bisogno Quadragesimo anno
Pope Pius XII Social teachings
Pope John XXIII Mater et magistra Pacem in terris
Second Vatican Council Dignitatis humanae Gaudium et spes
Pope Paul VI Octogesima adveniens Populorum progressio
Pope John Paul II Laborem exercens Sollicitudo rei socialis Centesimus annus Evangelium vitae
Pope Benedict XVI Caritas in veritate
Pope Francis Evangelii gaudium Laudato si' Fratelli tutti
Other figures Gaspard Mermillod René de La Tour du Pin Heinrich Pesch Dorothy Day Óscar Romero Joseph Bernardin Hilaire Belloc G. K. Chesterton
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Quadragesimo anno (Latin pronunciation: [kʷa.draˈd͡ʒɛː.si.mo ˈan.no]) (Latin for "In the 40th Year") is an encyclical issued by Pope Pius XI on 15 May 1931, 40 years after Leo XIII's encyclical Rerum novarum, further developing Catholic social teaching. Unlike Leo XIII, who addressed the condition of workers, Pius XI discusses the ethical implications of the social and economic order. He describes the major dangers for human freedom and dignity arising from unrestrained capitalism, from socialism, and from communism as practised in Russia. He also calls for the reconstruction of the social order based on the principles of solidarity and subsidiarity.

Essential contributors to the formulation of the encyclical were the German Jesuits, Roman Catholic theologians and social philosophers Gustav Gundlach and the Königswinter Circle through one of its main authors Oswald von Nell-Breuning.