Financial Performance Analysis of selected Oil and Natural Gas Companies in India(Oil and Natural Gas Corporation, Indian Oil Corporation Limited, Bharat Petroleum Corporation Limited) helps to evaluate their capital structure, credit strength, value of assets used for earning current profit, etc,... This study is done based on five previous financial year (2017-18 to 2021-222) data collected form the secondary data only. For the purpose of financial performance analysing different statistical tools were used namely Ratio Analysis(Debt Equity Ration, Capital Gearing Ration, Fixed assets turnover ratio, etc...), Anova. At last suggestion is also provided based on the findings from the analysis.