This study examined the relationship between knowledge management capabilities and the organisational sustainability of small and medium-sized enterprises (SMEs) in Yenagoa, Bayelsa State. The study conceptualises knowledge management capability as comprising structural, cultural, and technological dimensions that enable effective knowledge utilisation. A cross-sectional survey design was adopted, with data collected from 74 top management staff across thirty small and medium-sized enterprises using a structured questionnaire. The data were analysed using the Spearman Rank Correlation Coefficient to determine the strength and direction of relationships among the variables. The findings reveal that structural capability, cultural capability, and technological capability each have a positive and statistically significant relationship with organisational sustainability. These results underscore the significance of internal organisational capabilities in enhancing long-term viability and resilience of small and medium-sized enterprises. The study concludes that strengthening knowledge-supportive structures, fostering a collaborative organisational culture, and investing in appropriate technological systems are critical for sustaining SME performance. It therefore recommends that SME management should continuously develop and integrate these capabilities to enhance agility, competitiveness, and long-term organisational sustainability. 

Keywords: Knowledge management capabilities, structural capability, cultural capability, technological capability, organisational sustainability.