The purpose of the Neurophysiology Data Translation Format (NDF) is to provide a means of sharing neurophysiology experimental data and derived data between services and tools developed within the CARMEN project. This document specifies the NDF. The specification supports the types of data that are currently used by members of the CARMEN consortium and provides a capability to support future data types. It is capable of accommodating external data file formats as well as metadata such as user defined experimental descriptions and the history (provenance) of derived data.