This study investigated the impact of working capital management on the performance of deposit money banks in Nigeria from 2010 to 2021. The study utilized secondary data of eight (8) deposit money banks in Nigeria sourced from their audited financial statement and the Central Bank of Nigeria (CBN) Statistical Bulletin. Return on asset was used as index of bank performance and the study proxy working capital management using cash conversion cycle, current asset and current liability. The econometric methods employed in analysing the data were pooled ordinary least square, fixed effect and random effect estimators. The Hausman test revealed that fixed effect estimator is the best method in examining the relationship between monetary policy and bank performance. The result of the fixed effect model reveals a negative and insignificant relationship between cash conversion cycle and return on asset. Also, current asset had positive and significant effect on return on asset. In addition, the result reveals that current liability dampened the performance of the deposit money banks. The study concludes that, working capital management can enhance the performance of deposit money banks Nigeria. By this, the study recommends that management of the deposit money banks should increase their current asset by raising their liquid assets through prompt collection of borrowed funds.