Humanist Manifesto is the title of three manifestos laying out a Humanist worldview. They are the original Humanist Manifesto (1933, often referred to as Humanist Manifesto I), the Humanist Manifesto II (1973), and Humanism and Its Aspirations (2003, a.k.a. Humanist Manifesto III). The Manifesto originally arose from religious Humanism, though secular Humanists also signed.
The central theme of all three manifestos is the elaboration of a philosophy and value system which does not necessarily include belief in any personal deity or "higher power", although the three differ considerably in their tone, form, and ambition. Each has been signed at its launch by various prominent members of academia and others who are in general agreement with its principles.
In addition, there is a similar document entitled A Secular Humanist Declaration published in 1980 by the Council for Secular Humanism.
The first manifesto, entitled simply A Humanist Manifesto, was written in 1933 primarily by Roy Wood Sellars and Raymond Bragg and was published with 34 signatories including philosopher John Dewey. Unlike the later ones, the first Manifesto talked of a new "religion", and referred to Humanism as a religious movement to transcend and replace previous religions based on allegations of supernatural revelation. The document outlines a fifteen-point belief system, which, in addition to a secular outlook, opposes "acquisitive and profit-motivated society" and outlines a worldwide egalitarian society based on voluntary mutual cooperation, language which was considerably softened by the Humanists' board, owners of the document, twenty years later.