T This research aims to analyze the influence of green innovation and ecoefficiency on competitive advantage, with two control variables, namely firm size andfinancial performance. the research sample consists of companies in the energy,industrial, as well as tobacco and nondurable household products sub-sectors listedon the indonesia stock exchange (idx) during the period 2019–2021. the samplingmethod used is purposive sampling, resulting in a total of 109 companies with 327observations. the method of analysis used in this study is multiple linear regressionto examine the influence of independent variables on the dependent variable. greeninnovation and eco-efficiency were measured using content analysis based on annualand sustainability reports. the control variable firm size was measured using totalassets, while financial performance was measured by the return on assets (roa).the dependent variable, competitive advantage, was measured using return oninvested capital (roic), calculated by multiplying nopat divided by sales withsales divided by invested capital (ic). sthe results of the study conclude thefollowing:green innovation has a positive influence on the competitive advantage ofcompanies in , eco-efficiency also has a positive influence on competitive advantage,firm size has no significant influence on competitive advantage, financialperformance has a positive influence on competitive advantage. thus, this studyproves that implementing sustainable strategies such as green innovation and ecoefficiency plays a crucial role in enhancing the competitive advantage companies,especially in facing intense industrial competition and growing demands forenvironmental sustainability