Knee osteoarthritis is a degenerative disease that occurs due to progressive damage of the cartilage knee joint. The severity of the disease can be determined based on the clinical condition and several investigations. This inspection is expensive, so other alternatives are needed. One of the markers of inflammation is the Neutrophil Lymphocyte Ratio (NLR) but until now it has not been used to detect the severity of knee OA. This study aims to determine the relationship between the degree of knee OA and NLR. The method: cross-sectional design with medical record data of 75 knee OA patients at Al Fauzan General Hospital, Jakarta. The result: the highest distribution of patients old aged (≥60) years was 53 people (70,7%), 58 women (77.3%), with mild OA degree 45 people (60%), duration of OA history 4 years 74 people (98, 7%) and the highest BMI is obesity, 53 people (70.7%). The NLR values (<2.1) for mild OA were 33 (71.7%) and NLR (>2.1) for severe OA were 17 (58.6%). The significance test with Chi-Square obtained a p-value of 0.018 (< 0.05). Conclusion: there is a significant relationship between the degree of knee OA and NLR.