Despite women’s increased participation in the labour market significantly contributing to past economic growth, persistent gender gaps across OECD labour markets hinder full realization of the potential gains of women’s economic participation. This paper analyses the economic implications of these gaps and evaluates the potential for future growth through greater gender equality in labour market outcomes. Utilising two methodological frameworks, the paper first employs growth accounting to measure the contribution of women's employment to past economic growth. The paper then uses a simplified version of the OECD Long-Term Model in conjunction with projections on future labour force dynamics to estimate the impact of greater gender equality on the labour market. These analyses provide insight into the potentially significant economic benefits of closing persistent gender gaps across OECD countries.