©2019 Japan Society of Powder and Powder Metallurgy In this study, systematic investigation using cellulose nanofiber (CellNF) as a carbon source for selective laser sintering (SLS) of Al2O3 was conducted. A composite powder that consisted of CellNF and Al2O3 was fabricated using electrostatic adsorption (EA) method in aqueous suspension. Heat-treatment temperature of 500 and 800°C was compared for the conversion of CellNF to carbon residue (CR) in the Al2O3 composite. After that, the parameters involving the volume fraction of CR and effect of Al2O3 particle size in the CR-Al2O3 composite particle were also investigated in order to obtain an optimized condition of the CR-Al2O3 composite particle for SLS. From the results obtained, 1.5 wt% CR-Al2O3 with alumina size of 0.8 μm that was heat-treated at 800°C exhibited optimum laser sinter ability owing to the good CR distribution over a higher surface area that promoted good laser adsorption for the alumina sintering.