Mark Ivor Satin (born November 16, 1946) is an American political theorist, author, and newsletter publisher. He is best known for contributing to the development and dissemination of three political perspectives – neopacifism in the 1960s, New Age politics in the 1970s and 1980s, and radical centrism in the 1990s and 2000s. Satin's work is sometimes seen as building toward a new political ideology, and then it is often labeled "transformational", "post-liberal", or "post-Marxist".