Erf or ERF may refer to:
Industry 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
Mathematics Error function, erf Exponential response formula
Science and technology 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
People
Keith Erf, American politician
Other uses 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: ), a Christian denomination in France