The quality of education in any country rests on school communities as a whole. However, the real implementers of innovations and changes in curriculum are teachers. Teachers, as practitioners, are the ones most often held accountable for successes and failures in educating schoolchildren. The way to facilitate teachers in handling challenges and keeping up with curriculum renewals is through constant support in the form of continuing professional development (CPD) by means of action research. Action research as CPD has been viewed as a critical platform for advocating change, which is the outcome of teachers’ ability and autonomy to lead in making informed decisions about their own practices. Given its usefulness, action research is found well established, vastly practiced, and widely published in Western countries. This has raised the question of the widespread use of action research as CPD in the Southeast Asian (SEA) region. Preliminary analysis reveals that in some SEA countries, such as Timor Leste, there is limited literature on action research, while in countries such as Malaysia, Singapore, and Thailand, action research has been well documented. At the same time, there is an emerging trend in SEA countries to adopt different models of action research. In Malaysia, for instance, action research has been primarily classroom based, whereas in Indonesia, a critical and community based approach to action research seems to be prevalent. This suggests that the kinds of action research conducted in the different SEA countries may reflect variations in cultural, economic, and geographical landscapes. Given the importance of action research to teacher practitioners and school leaders, and in providing an identity to the action research approaches conducted in Southeast Asia, the historical trail of action research presents a window into the nature of CPD concerns of each country, as well as the successes and challenges of conducting action research as CPD for sustained impact.