ERP is a TLA (three-letter abbreviation) that may stand for:

• Early redemption penalty
• Early retirement plan
• Earth rotation parameters
• Effective radiated power
• Effective refractory period
• Ejército Revolucionario del Pueblo (Argentina)
• Electronic road pricing
• Emergency response plan
• Emergency response program
• Employee retirement plan
• Enterprise resource planning
• Environmental resource permit
• Environmental resource planning
• Error recovery procedure
• Estimated retail price
• Event-related potential
• Extended refit period
• Exterior router protocol