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Dualism is the view that two fundamental concepts exist, such as good and evil, light and dark, or male and female. Often, they oppose each other. The word's origin is the Latin dualis, meaning "two" (as an adjective).

Moral dualism is the belief of the coexistence (in eastern and naturalistic religions) or conflict (in western religions) between the "benevolent" and the "malignant". Most religious systems have some form of moral dualism - in western religions, for instance, a conflict between good and evil.

Like ditheism/bitheism, moral dualism does not imply the absence of monist or monotheistic principles. Moral dualism simply implies that there are two moral opposites at work, independent of any interpretation of what might be "moral" and - unlike ditheism/bitheism - independent of how these may be represented.