Within the framework of the circular economy, recycling and reuse play a role in ‘close the loop’ of product life cycles. The life cycles of the product can be extended to the next generation through separate waste collection. In this respect, the separate waste collection should be regarded as a fundamental part of circular economic strategies. Improving separate waste collection is the path to sustainable consumption and production as well as the implementation of a circular economy. The purpose of this study is to investigate the convergence of separate waste collection ratio of municipal solid waste in South Korea. For this purpose, two empirical analyses on the convergence were performed. First, absolute and conditional β-convergence analyses were employed to determine whether a decrease exists in the gap among 17 regions (8 cities and 9 provinces) for the separate waste collection ratios of municipal solid waste. In the second empirical analysis, a unit root test was conducted to investigate the status of stochastic convergence of the separate waste collection ratio of municipal solid waste by region. As the result, no evidence of absolute and conditional β-convergence for separate waste collection ratios of municipal solid waste among regions was identified following the first empirical analysis. The second empirical analysis showed that the separate waste collection ratio of municipal solid waste of 2 cities and 1 province (Busan, Daegu, and Gyeongsangbuk-do) exhibited a stationary time series.