The 1st IWA Sustainable Natural and Engineered Water Systems Management Conference 2023 was successfully organized during December 13th-16th, 2023 at Pathumwan Princess Hotel, Bangkok, Thailand by the Department of Environment Engineering, Prof. Aroon Sorathesn Center of Excellence in Environmental Engineering and Center of Excellence on Hazardous Substance Management of Chulalongkorn University. Many thanks to all organizing and scientific committee members and our sponsors: Gulf Energy Development Public Company Limited, IRPC Public Company Limited, PTT Public Company Limited, and Sci Spec Company Limited. We provided a platform that brings together more than 100 experts, researchers, and young water professionals from Korea, China, USA, Japan, Spain, India, Australia, UAE, Cambodia and Thailand to seek solutions and develop sustainable water management systems.