This article reports the findings of a study that explored Omani TESOL teachers beliefs about continuing professional development (CPD). Data were collected using questionnaires, semi-structured and focus group interviews with EFL teachers in Oman. The findings revealed that a key source influencing teachers? CPD participation is their beliefs, and that participants? hold a wide range of beliefs about CPD. Participants? responses seem to be affected mainly by their experience of participating in CPD events and/or the beliefs they hold about teaching and learning (Vries et al., 2013). The article explores the implications of the findings for teacher education and the development of TESOL teachers in Oman.