AbstractCurrent seminal studies on teacher creativity and teaching effectiveness have been widely investigated by numerous researchers. Most of them explored both variables (teacher creativity and effectiveness) from various aspects such as the perspectives of teachers, learners, and of gender but they failed to address one important variable, namely the influence of professional development background on these variables. Consequently, this study aims to analyse the influence of blended teacher professional training on teaching creativity and teaching effectiveness from the learners’ perspective. A sample of 901 learners from various secondary schools in East Java province was randomly assigned to rate 120 EFL teachers using both the English language teaching creativity scale (ELT-CS) and the English language teaching effectiveness scale (ELT-ES). For this purpose, a validated and reliable five-point Likert scale of ELT-CS and ELT-ES (1 = totally disagree, 2 = disagree, 3 = partially agree, .....