E4, E.IV or E-4 may refer to.
Entertainment Film Distributors is a British distributor of independent films in the UK and Ireland for various production companies, currently run by Nigel and Trevor Green.
In statistics, errors-in-variables models or measurement error models are regression models that account for measurement errors in the independent variables.
The Fokker E.IV was the final variant of the ''Eindecker'' fighter aircraft that was operated by Germany during World War I.
Indicator value is a term that has been used in ecology for two different indices.