This research aimed to study and test the competitiveness of companies listed in the Egyptian sustainable development index, by studying and testing the relationship between the company's inclusion in the sustainable development index and competitiveness (Firm value, Firm profitability, and sales growth rate) in Egyptian Listed companies, on a sample consisting of 30 companies continue to be included in the sustainable development index as an experimental group, equivalent to 75% of the total companies included in the index over the research period, which amounted to (40) companies, 21 companies not listed in the index as a control group of joint stock companies registered in the stock market, over the period )2017-2020( based on Eviews 09 for statistical analysis purposes. The results of the research showed that there were significant differences between the profitability and value of companies listed in the sustainable development index and unlisted in favor of companies listed in the sustainable development index, which was confirmed by the regression results of a positive relationship between inclusion in the sustainable development index and the profitability and value of the facility as a measure of ability competitiveness. While there are no differences between the sales growth rate of listed and unlisted companies, which was confirmed by the regression results from the absence of a relationship between inclusion in the sustainable development index and the sales growth rate as a measure of competitiveness. The results of the research indicated that inclusion of the company in the sustainable development index is a tool to increase the competitiveness of companies through the positive impact of including companies in the sustainable development index on the profitability and value of the firm. Keywords: Sustainable development index, Sustainability disclosure, Sustainability reports, competitiveness, Firm value, profitability, Sales growth rate.