The aim of this study was to evaluate the energy and emission properties of selected fractions of common hazel (Corylus avellana L.) waste biomass and to compare them regardless of variety. The study covered four biomass fractions: shells, pericarp, leaves and shoots, ob-tained from a plantation located in south-eastern Poland. The scope of the analyses included the determination of moisture content, ash content, volatile matter, fixed carbon, elemental composition, heat of combustion and calorific value, as well as the calculation of emission factors and the volumetric composition of flue gases. Significant differences were found between the studied biomass fractions. The most favourable fuel profile was exhibited by the husks, which recorded the highest HHV and LHV values, amounting to 18.65 and 17.37 MJ·kg⁻¹ respectively, the highest carbon content (51.01%) and fixed carbon content (22.32%), and at the same time the lowest ash content (0.82%), nitrogen (0.36%) and sulphur (0.01%). Leaves, on the other hand, were characterised by the highest ash content (9.26%), nitrogen (2.12%) and sulphur (0.14%), which was reflected in the highest emission values of NOₓ, SO₂ and particulate matter, amounting to 7.48, 0.29 and 11.69 kg·Mg⁻¹. The shoots had the highest hydrogen (7.40%) and oxygen (47.11%) content, as well as the highest volume of water va-pour in the flue gas (1.03 Nm³·kg⁻¹), whereas the fruit pericarp had the lowest HHV and LHV values, 15.94 and 14.76 MJ·kg⁻¹ respectively. In terms of flue gas parameters, the husks were characterised by the highest theoretical oxygen demand (1.07 Nm³·kg⁻¹) and the highest CO₂ volume in the flue gas (0.95 Nm³·kg⁻1), whilst the leaves generated the highest total flue gas volume (7.59 Nm³·kg⁻¹). The results obtained confirm that hazelnut biomass is not a homo-geneous fuel, and the selective use of its fractions can increase energy efficiency and reduce the environmental impact of the combustion process.