This dataset contains the point clouds, quantitative structure models (QSM) and destructively sampled reference mass and density of 65 trees. A part of this dataset was used in Demol et al. (2021) https://doi.org/10.1007/s00468-020-02067-7 and many details about the site and data collection can be found in this publication. The point cloud data was collected with a RIEGL VZ-1000 and VZ-400 time-of-flight laser scanner at five sites, covering four species ( Fagus sylvatica , Pinus sylvestris , Fraxinus excelsior , Larix decidua ) on windless and days without precipitation. The scans were coregistered in RiScanPro. Single trees were extracted from the forest scene using treeseg (https://github.com/apburt/treeseg) and filtered using a deviation filter (max 12), and reflectance filter (min -17 dB), and then downsampled to a point spacing of 10 or 15 mm. We used TreeQSM v.2.3 (https://github.com/InverseTampere/TreeQSM) to build QSMs from single tree point clouds. Fresh total tree mass was measured on-site after felling of the trees. Fresh mass was converted to tree volume using fresh wood density measurements on discs sampled from the felled trees (at breast height, and for a subsample of trees, every 300 cm along the main axis of the tree).