Maritime archaeology in Southeast Asia is a vibrant area of research that entails a hugely diverse dataset. Historical and anthropological records are combined with archaeological material in attempts to interpret the tangible and intangible heritage connected to the use of the aquatic environment. Seas, rivers, and lakes create fluid environments and provide space for socioeconomic activities. The role of maritime archaeologists is to interpret that connection and exchange by looking at the issue from a water perspective, taking into account the intricate entanglement between humans, objects, and the watery environment that make up maritime communities. From this perspective, maritime archaeology has also developed specific theoretical frameworks to interpret archaeological data. This chapter provides an overview of the discipline in Southeast Asia, of the current projects and trends, and explores different ways of inquiry that can be used to apprehend human-environment interactions in sea, rivers, and lakes.