This thesis presents Giovanni Gentile’s actual idealism as a radical constructivist doctrine for use in moral theory. The first half describes the moral theory that Gentile explicitly identifies with actual idealism, according to which all thinking, rather than an exclusive domain of ‘practical reason,’ has a moral character. It is argued that after Gentile’s turn to Fascism in the early 1920s, this theory is increasingly conflated with his political doctrine. This entails several major changes that cannot be squared with the underlying metaphysics. The second half of the thesis develops a more plausible account of Gentilean moral constructivism based on the pre-Fascist idea of reasoning as an internal dialogue. Comparisons and contrasts ar...