This paper presents a new surface reflectance climatology derived from TROPOMI observations on the Sentinel-5P satellite. The database contains the directionally dependent Lambertian-equivalent reflectivity (DLER) of the Earth's surface for 21 wavelength bands (328–2314 nm) and for each calendar month. The spatial resolution is 0.125° × 0.125°, and the DLER accounts for the anisotropy of surface reflection using a third-order parameterisation of the viewing angle dependence. The database includes a cloud shadow detection technique to avoid dark scenes due to cloud shadow. The DLER is validated against heritage LER databases based on GOME-1, OMI, SCIAMACHY, and GOME-2 data, showing good agreement within 0.002–0.02 in the UV-VIS range, up to 0.003 in the NIR, and below 0.001 in the SWIR. The DLER is also validated against MODIS surface BRDF data, showing better performance than traditional LER. The TROPOMI DLER database is a significant improvement over previous surface albedo databases and can be used for satellite retrievals from TROPOMI and other polar-orbiting instruments with similar equator crossing times. The algorithm can be applied to other satellite missions, including OLCI, Sentinel-5, and 3MI. The paper discusses the theory behind Lambertian surface reflection, the algorithm setup, and the validation results. The TROPOMI DLER database provides a more accurate representation of surface reflectance, accounting for directional dependence and improving the accuracy of atmospheric retrievals. The database includes a directional description of surface reflection, with improved angular dependence compared to the GOME-2 DLER database. The database is validated against heritage LER databases and MODIS BRDF data, showing good agreement. The TROPOMI DLER database is a valuable tool for satellite retrievals of atmospheric composition and surface properties.This paper presents a new surface reflectance climatology derived from TROPOMI observations on the Sentinel-5P satellite. The database contains the directionally dependent Lambertian-equivalent reflectivity (DLER) of the Earth's surface for 21 wavelength bands (328–2314 nm) and for each calendar month. The spatial resolution is 0.125° × 0.125°, and the DLER accounts for the anisotropy of surface reflection using a third-order parameterisation of the viewing angle dependence. The database includes a cloud shadow detection technique to avoid dark scenes due to cloud shadow. The DLER is validated against heritage LER databases based on GOME-1, OMI, SCIAMACHY, and GOME-2 data, showing good agreement within 0.002–0.02 in the UV-VIS range, up to 0.003 in the NIR, and below 0.001 in the SWIR. The DLER is also validated against MODIS surface BRDF data, showing better performance than traditional LER. The TROPOMI DLER database is a significant improvement over previous surface albedo databases and can be used for satellite retrievals from TROPOMI and other polar-orbiting instruments with similar equator crossing times. The algorithm can be applied to other satellite missions, including OLCI, Sentinel-5, and 3MI. The paper discusses the theory behind Lambertian surface reflection, the algorithm setup, and the validation results. The TROPOMI DLER database provides a more accurate representation of surface reflectance, accounting for directional dependence and improving the accuracy of atmospheric retrievals. The database includes a directional description of surface reflection, with improved angular dependence compared to the GOME-2 DLER database. The database is validated against heritage LER databases and MODIS BRDF data, showing good agreement. The TROPOMI DLER database is a valuable tool for satellite retrievals of atmospheric composition and surface properties.