The SEAFDEC Training Department (TD) in cooperation with the United States Agency for International Development (USAID), Department of the Interior (DOI) of United States and Mekong River Commission (MRC) organized the Fish Passage Engineering Design, Construction, Ecology, and Monitoring Workshop from 13 to 16 November 2018 at TD, Samut Prakan province. There were sixty participants from SEAFDEC Member Countries participated in this workshop. The workshop provided technical engineering concepts needed for the selection of appropriate fish passage designs for specific sites, designing fish passes to maximize fish passage success, and construct cost-effective structures with long lifespans; information on developing fish passage criteria, identifying target species understanding river hydrology, evaluating fish swimming abilities, and designing monitoring programs. After the workshop, the participants were able to have an improved understanding of migratory fish ecology, understand the principles of fish passage design, developed a range of fish passage concepts for a given site, critically selected an appropriate entrance location; understanding good and bad designs, critically select an appropriate fish passage design, understand the importance of monitoring programs and the good and bad construction practices and oversight.