Distributism is an economic theory asserting that the world's productive assets should be widely owned rather than concentrated. Developed in the late 19th and early 20th centuries, distributism was based upon Catholic social teaching principles, especially Pope Leo XIII's teachings in his encyclical Rerum novarum (1891) and Pope Pius XI in Quadragesimo anno (1931). It has influenced Anglo Christian Democratic movements, and has been recognized as one of many influences on the social market economy.

Rerum novarum, or Rights and Duties of Capital and Labor, is an encyclical issued by Pope Leo XIII on 15 May 1891. It is an open letter, passed to all Catholic patriarchs, primates, archbishops and bishops, that addressed the condition of the working classes.