Institutionalism can refer to:
- New institutionalism: a social theory that focuses on developing a sociological view of institutions, the way they interact and the effects of institutions on society.
- Institutional economics
- New institutional economics: an economic school that analyzes social norms, organizational arrangements etc.
- Historical institutionalism: a social science method of inquiry that uses institutions as subject of study in order to find, measure and trace patterns and sequences of social, political, economic behavior and change across time and space.
- Institutionalism in political parties: an approach that sees political parties as having some capacities for adaptation, but also sees them as being "prisoners of their own history as an institution".
- Institutionalism in international relations: a branch of international relations theory that holds that the international system is not—in practice—anarchic, but that it has an implicit or explicit structure which determines how states will act within the system.
institutionalism in Swedish: Institutionalism