Theory of ir
- Theory of irrational numbers
- Theory of irrelevance
- Theory of irreducible complexity
- Theory of irrigation
- Theory of irony
- Theory of ironic process
- Theory of irving fisher
- Theory of iron cage
- Theory of irregular verbs
- Theory of iron man
- Critical theory of ir
- Marxist theory of ir
- Feminist theory of ir
- Theory of irrelevance of dividend policy
- Theory of interest irving fisher