ABSTRACTThe conflicts in Thailand’s southern border provinces and Mindanao have not only posed a challenge to the Thai and Philippine governments, but have also affected the respective governments’ relations with Malaysia. From a comparative perspective, this article aims to illustrate how a complicated web of interactions between domestic and international factors has not only shaped domestic decision-making, but also influenced how states interact with one another in regard to the conflicts, which has resulted in a mix of cooperation and contention. It is argued that despite past downturns in bilateral relations, various developments have paved the way for Malaysia to play a role in the current peace processes in Thailand’s southern border provinces and Mindanao. However, Malaysia has been able to accomplish more in Mindanao’s peace process due to several favourable conditions, including the Philippine government’s openness towards third-party involvement, regional security concerns and politics that ha...