This article provides a review of academic studies on natural gas market integration, tracing the shift from regional segmentation to global interconnectedness. It explores the roles of market liberalization, infrastructure development, and liquefied natural gas (LNG) trade growth in transforming the global gas landscape. By analyzing key methodological approaches, the review highlights the progression of integration in European, North American, and Asian markets. The findings underscore the increasing interconnectedness of gas markets, the challenges of achieving full global integration, and the implications for pricing, investment, and energy security. Read more