The dataset presents the roadless areas (RAs) of Greece (2/2020) in kmz format (Google Earth). RAs are defined as those land patches of a size greater than 1 sq.km that are at least 1 km away from the nearest road. The dataset pinpoints the 1.115 RAs, accounting for 4.99% of the Greek land. The map includes high and medium confidence data. Red polygons indicate the RAs with an area ≥50 sq.km (high confidence data). They cover 0.51% of the Greek land and are located in six remote mountains: Lefka Ori, Timfi, Olympos, Taygetos, Saos, and Smolikas. The present database is the output of ROADLESS project. It is linked to the publication Kati et al (2020: Biol Cons) and it was used by the Greek government to set up the “untrodden mountain” legislation, offering protection to all large roadless areas (apart from Olympos that is protected under a recent Presidential Decree), plus a smaller roadless area (Hatzi mountain). Orange polygons indicated the RAs with an area 1-50 sq.km and are of medium confidence, because their roads are not fully digitized. This version is not used any more. It is replaced with the v2 (2022) where all data are of high confidence.