ERP or Erp may refer to:
Economics Effective rate of protection, of tariffs Equity risk premium, excess return on risky investments European Recovery Program or Marshall Plan
Science and technology Effective radiated power, of directional radio transmission Electronic Road Pricing, in Singapore Enterprise resource planning, a business process system
Medicine Effective refractory period, in a cardiac cycle Estrogen receptor positive, a cancer pathology test result Event-related potential, a measured brain response Exposure and response prevention, a treatment method in behavioral therapy OspE/F-like related protein, in Lyme disease microbiology
Places Erp, Ariège, a village in France Erp (Germany), a village Erp, Netherlands, a town
Other uses Erp (Pict), father of Drest I of the Picts Ejército Revolucionario del Pueblo (disambiguation), (Spanish for People's Revolutionary Army), several Latin American communist or socialist organizations Energy-related products (sometimes as ErP) that use or affect energy consumption Erotic role-playing, the use of role-playing in sexual or romantic contexts
See also Van Erp, a Dutch surname D'Erp Castle, Baarlo, Limburg, Netherlands Ethernet Ring Protection Switching (ERPS), used in Ethernet networks Earp (disambiguation)