Mindfulness has been overlooked in previous studies of second or foreign language learning. This study aims to explore the relationship between mindfulness, anxiety, burnout and self-perceived foreign language proficiency among a sample of 492 learners. Further, it seeks to make up for the deficiency in the current empirical literature regarding the mediation roles of anxiety and burnout in the relationship between mindfulness and students' self-perceived foreign language competence. The findings were as follows: (1) students have a moderate level of mindfulness and foreign language anxiety, low level of perceived proficiency and foreign language learning burnout; (2) an increased level of mindfulness was associated with higher perceived foreign language competence and lower levels of anxiety and burnout; (3) anxiety and burnout mediated the relationship between mindfulness and students' self-perceived FL proficiency. It is suggested in the implications that school administrators and policymakers might need to provide space and time to integrate mindfulness practices into the curricula. Language instructors could also incorporate brief and accessible interventions in classrooms to enhance students' level of mindfulness. Limitations and future directions are discussed for further investigations.