may refer to:
- Dualism, the moral or spiritual belief that two fundamental concepts exist, which often oppose each other
- Dualistic cosmology, the religious belief that the universe is created or governed by two, often opposing deities or spiritual forces.
- Dualism (philosophy of mind), a set of views about the relationship between mind and matter, which begins with the claim that mental phenomena are, in some respects, non-physical
- Property dualism, a philosophy of mind and a subbranch of emergent materialism
- Epistemological dualism, a philosophical concept also known as representative realism, indirect realism, and the veil of perception
- Dualism (law), a principle in contending that international and domestic law are distinct systems of law, and that international law only applies to the extent that it does not conflict with domestic law
- Dualism (politics), the separation of the responsibilities of cabinet and parliament