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Property dualism describes a category of positions in the philosophy of mind which hold that, although the world is composed of just one kind of substance—the physical kind—there exist two distinct kinds of properties: physical properties and mental properties. In other words, it is the view that non-physical, mental properties exist in, or naturally supervene upon, certain physical substances.
Substance dualism, on the other hand, is the view that there exist in the universe two fundamentally different kinds of substance: physical and non-physical , and subsequently also two kinds of properties which inhere in those respective substances. Substance dualism is thus more susceptible to the mind–body problem. Both substance and property dualism are opposed to reductive physicalism.