Cash is a valuable yet scarce resource that all businesses have in limited quantity. Present research on cash management has focused on its connection with many important areas such as the effect on the liquidity of the business, its financial performance, bankruptcy, and the overall working capital itself. To validate the relationships between cash management and financial performance, 36 companies listed in Muscat Securities Market (MSM) had been chosen over time, starting from 2014 ending to 2019. For this, the study used cash management ratios, which were the Cash Ratio (CR), Operating Cash to Debt Ratio (OC-DR), and the financial performance ratios are Return on Assets (ROA), Return on Equity (ROE) and Net Profit Ratio (NPR). The CR has a statistically significant positive correlation with ROA of 0.176, ROE of 0.103 and NPR of 0.193 values. The OC-DR also has a statistically significant positive relationship with ROA (0.471), ROE (0.133), and NPR (0.422). The R-square value was 17.8%, where NPR is a dependent variable. When Return on Asset has been taken as a dependent variable, the R-square value was identified as 22.2%. But ROE has a limited impact on the independent variables with 2%. Overall, the main conclusion drawn is that cash managemen practices used by the Omani manufacturing firms are explaining a significant amount of the financial performance However other relevant factors such as the amount of manufacturing sales contracts received, the social development status of the business, impact of the financial crisis within the economy on the demand of the goods or commodities etc. may influence the cash management practices and draw a better conclusion. The findings can be helpful for policy makers in understanding the main factors that impact cash management and how these factors can be regulated.