IRF may refer to: General Impulse response function Information Retrieval Facility Initial Reaction Force or Internal Response Force Immediate Response Force Institute of Space Physics (Sweden), (Institutet för rymdfysik) Interferon Regulatory Factor (e.g. IRF6) International Rectifier, New York Stock Exchange symbol IRF Foundations/organizations International Ranger Federation International Rabbinic Fellowship International Rogaining Federation Islamic Research Foundation International Rafting Federation International Ringette Federation Computing Intelligent Resilient Framework, Virtual Switch Chassis Aggregation