The demands of education in today’s world undeniably requires the presence of professional teachers who are knowledgeable, skillful, independent, creative, innovative, visionary, and character. This premise accentuates that teachers at all level of education need to acquire at least four main competences: professional, pedagogic, social, and personal. These main competences would enable them to perform current expected teaching demands. The article employs theories of professional development and social constructivist learning in which social and practical aspects of learning and teaching are taken into account. It draws on personal observations, reflections on current events, and experience of the authors while taking into accounts some empirical findings of researchers in the field of education. Given the central role of professional teachers in the era of industrial revolution 4.0, the article discusses three main issues in regards to current teaching and learning realms: a) teacher professionalism; b) challenges to teaching profession in contemporary world and how teachers deal with them; and c) urgency for effective Subject-based Teacher Forum - STF and Classroom-based Teachers Work Group - CTWG that are expected to support teachers to achieve their professional goals. Hence, the article is expected to provide conceptual and practical information regarding teacher professionalism and its challenges and how STF and CTWG forums support teachers to perform their teaching tasks and responsibilities and overcome the ever-increasing challenges to teaching setting in contemporary educational settings. In particular, the article informs the urgent needs of teachers’ forums which are able to promote teacher professionalism and provide solutions for the improvement of learning and teaching practices in Indonesia.