ERF

• Enerplus, a North American energy producer whose stock is listed as ERF under the TSX and NYSE
• ERF (truck manufacturer), a former British truck manufacturer

• Error function, erf
• Exponential response formula

• Effective radiative forcing, a concept to compare radiative forcing in climate models
• ERF (gene), coding for ETS domain-containing transcription factor
• Electrorheological fluid
• Eukaryotic release factors
• Event-related field

• Keith Erf, American politician

• Erf (law), in real estate law
• Erf (river), in Germany
• Estuarine Research Federation, an American environmental organization
• Erfurt-Weimar Airport, in Germany (IATA code)
• European Racquetball Federation
• European Refugee Fund
• Extreme Reaction Force, in United States military prisons
• Reformed Church of France (French: {{lang|fr|Église réformée de France}}), a Christian denomination in France

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