Today's world may be characterised as the dawn of the new millennium of the learning society, where knowledge is considered as a country's most valued asset and primary source of power. In the increasingly intense competition among international communities, Thailand has been respected for advancing the concept of transforming communities, cities and regions into learning societies engaged in a sustainable development strategy which promotes the continual learning of individuals--the smallest unit of society. The learning society approach aims to balance economic, social, natural and environmental aspects and resources of society; and is transforming the Thai people into knowledge citizens and knowledge workers. The underlying legislation carries stipulations concerning lifelong learning, educational enhancement and global competitiveness aimed towards developing appropriate manpower to move the society towards sustainable happiness as compared and contrasted with maintaining the "status quo". This article portrays the current situation of lifelong learning and education in Thailand; analyses and synthesises five best-practice learning society case studies and proposes guidelines for developing a sustainable learning society.