IEP may refer to:

• Immunoelectrophoresis, biochemistry method
• Inclusion–exclusion principle, in the mathematics branch of combinatorics
• Integrated electric propulsion, in marine propulsion
• Isoelectric point, the pH where a molecule is electrically neutral

• Individualized Education Program, in the United States, for children with disabilities
• Instituts d'études politiques (Institutes of Political Studies), higher education institutions in France
• Institute for Economics and Peace, a think tank
• Institute for European Politics, a Berlin research centre
• Institute for Political Studies – Catholic University of Portugal (Portuguese: Instituto de Estudos Políticos)
• Internet Encyclopedia of Philosophy

• Icahn Enterprises, an American conglomerate
• Independent Expert Panel, concerned with misconduct by members of the UK parliament
• Institute of Employability Professionals, a British professional association
• Intercity Express Programme, a British rail transport initiative
• Irish pound, the pre-euro currency of Ireland

This disambiguation page lists articles associated with the title IEP.
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