The study titled “Performance and Emission Studies on a 4 stroke Diesel Engine Using Methyl Ester of ALGAE Oil with EGR” involves the study of performance and emission characteristics of Blends of Methyl Esters of ALGAE oil by varying the EGR control value (5 to 20%) using direct injection diesel engine. From various researches it’s found that NOX emission is higher in ALGAE based biodiesel. In this study the cooled EGR is used as it can reduce the NOX emission.