The study was carried on poly(butylene succinate) (PBS) and nanofibrillated cellulose (NFC) composites obtained by two methods – melt blending and solution casting, with different NFC loadings. PBS/NFC composites with 5 – 70% NFC content were prepared by solution casting and 1 – 20% – by melt blending. Thermal stability and crystallinity were studied with differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Mechanical properties were studied with dynamic mechanical analysis (DMA) and universal mechanical testing machine Tinius Olsen. Biodegradability of obtained composites was studied by biodegradation in composting conditions. DCS analysis did not reveal any significant differences in melting temperatures, regardless of NFC loadings and composite preparation method. DMA and tensile test showed enhanced properties, however TGA tests revealed reduced thermal stability. Biodegradability of PBS/NFC composites increased with increasing NFC content.