This submission includes both linear and nonlinear wave spectra for time series taken off the Ekofisk Oil Platform in the North Sea for the years 2003-2020. The raw data was sourced from the Norwegian Meteorological Institute (https://www.met.no/en) and processed in Matlab. This data was complied in an effort to study the dynamics of wave energy converters (WEC). Both linear and nonlinear spectra were collected to demonstrate the differences between linear and nonlinear wave models for use as a forcing function for WEC motion. The spectra and time series form a complete set of the data used as inputs for numerical simulations.