This research explores the recent trends (1987-2018) of forest above-ground live biomass (AGB, in tonnes/hectare or t/ha) in Romania, based on multiple remote sensing (Landsat) and forest inventory (permanent sampling plots) data that were analyzed yearly (in the summer season) across Romanian forestlands, using a series of complex statistical algorithms. After modelling interannual AGB data, the resulting yearly raster values were explored as trends (in terms of direction, magnitude and statistical significance) over the 32 years, using the Sen's slope estimator and Mann-Kendall test. A large volume of climate data was also processed, in order to detect possible statistical relationships between climate and forest biomass. The results showed that, while ~70% / ~30% of the total area of national forest changes was affected by increasing / decreasing trends, about half / one fifth of all positive / negative AGB trends are statistically significant nationally. At the same time, an average AGB increase of ~3 t/ha/yr and a total forest biomass gain of ~6.4 Mt (megatonnes) were found in Romania, over the entire 1987-2018 period. Also, only a low to moderate climate change impact in forest biomass dynamics has been detected throughout Romania. All findings of this study may be useful to various forestry stakeholders and policymakers operating regionally or centrally in Romania.