In recent years the concept of competitive advantage has taken centre stage in discussions of business strategy; that is why one of the major challenges organizations face today is how to have a competitive advantage. In most cases, a stand-out product will do the job, since products are perceived as both highly relevant and meaningfully, the ability for any one product to stand out in a competitive category will guarantee the success of such an organization. While there are numerous ways to differentiate brands, identifying meaningful product-driven differentiators can be especially fruitful in gaining and sustaining a competitive advantage. Product maturity is when a firm or brand has grown to the point where it outperforms rival brands in the provision of a feature(s) such that it faces reduced sensitivity for other features. This study used a sample of 150 respondents to provide evidence on the relationship between product maturity and firms' competitive advantage in Nigeria. The study employed the ordinary least square (OLS) regression analysis. This study finds a positive and significant relationship between product maturity and firms' competitive advantage, as well as a positive and significant relationship between product differentiation and competitive advantage. This study, therefore, recommends that.