Theory of world
- Theory of world system
- Theory of world security
- Theory of world creation
- Theory of world peace
- Theory of world map
- Theory of worldview
- Theory of change world bank
- Theory of many worlds
- Wallerstein theory of world system
- Theory of three worlds
- Theory of parallel world
- Theory of modern world system
- Theory of possible worlds
- Relational theory of world politics
- Theory of rna world