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The IASI spectrally resolved Outgoing Longwave Radiation product (IASI OLR) is a monthly (L3), 2 x 2 degree global dataset of spectral OLR derived from the clear-sky IASI satellite radiance measurements in the range 645-2300 cm-1 at the 0.25 cm-1 native spectral sampling of the L1C spectra. The algorithm for the conversion of the spectra to the OLR is detailed in Whitburn et al. (2020, Journal of Climate). It relies on precalculated angular distribution models (ADMs) constructed for over 140,000 different scene types (characterized by surface and atmospheric parameters). These were selected from one year of Copernicus Atmosphere Monitoring Service (CAMS) reanalysis data. The method was applied to reprocessed IASI L1C data, in order to produce a homogeneous spectral OLR dataset from 2008 to present. The dataset consists of monthly mean NETCDF files of around 500 MB each. It represents 23 GB for Metop-C data (201907-202209). Each file includes the gridded spectral OLR calculated separately for day and nighttime IASI observations. Missing values are set at NaN. Size of the grids: 91 lines (from -90 to 90 °N), 181 columns (from -180 to 180 °E), 6621 aisles (between 645 and 2300 cm-1 by step of 0.25 cm-1). Unit: W ∙ m-2 ∙ cm-1.