In this study, microcrystalline cellulose (Alfa-MCC) was extracted from Alfa fibres using acid hydrolysismethod. The molecular weight of the cellulose samples was determined by gel permeation chromatog-raphy. The crystallinities were studied by means of X-ray diffraction and solid state cross polarizationmagic angle spinning13C nuclear magnetic resonance spectroscopy, revealing that Alfa-MCC was morecrystalline than the native cellulose isolated from Alfa fibres. The morphology of the celluloses wasinvestigated using scanning electron microscopy, showing a compact structure and a rough surface. Fur-thermore, a good thermal stability was shown for Alfa-MCC. Based on these analyses, Alfa-MCC showedtremendous potential use as composites reinforcing agent, foods stabilizer and pharmaceutical additive.