We aimed to analyse the efficiency scores of the Organisation for Economic Co-operation and Development countries in achieving sustainable development through the regulatory impact analysis. We employed the data envelopment analysis method based on an output-oriented approach to reach the aim. The main result indicated that most countries reached low efficiency scores; on the contrary, the United Kingdom was the only country with a maximum efficiency score due to the significant improvements associated with the regulatory impact analysis in supporting sustainable development since the 1990s. We also specifically compared the situations of the best- and worst-performing countries. Therefore, we improved some policy recommendations for how the worst-performed countries could increase their efficiency levels. The study’s originality is that it is a scarce empirical study focusing on the achievements of OECD countries through efficiency scores by concerning the RIA implementations in supporting SD.