The development ofNatural fibers innovative materialsCharacterization has driven the search for alternative and sustainable raw materials that enhance performance while maintaining environmental responsibility. In this context, natural fibersNatural fibers with low density, favorable mechanical propertiesMechanical properties, and biodegradability have emerged as promising candidates. This study aimed to investigate the thermal and morphological characteristics of Mucajá fiber. The fibers were characterized using Thermogravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), and Scanning Electron Microscopy (SEM). TGA results demonstrated thermal stability up to approximately 262 °C, with complete degradation occurring near 700 °C. DSC analysis revealed an endothermic peak at 77.15 °C (∆H = 147 J) and an exothermic peak with enthalpy of 54 J. SEM micrographs showed surface irregularities and the presence of pores along the longitudinal section of the fiber. These findings suggest that Mucajá fibers exhibit promising characteristics for application in various sectors, particularly in the development of composite materialsComposite materials.