The present study examines high school students' burnout levels. The main aims of the study are to investigate whether their burnout levels vary according to gender and grade levels, and to check the correlation between overall burnout levels and their English language proficiency attained with a specific test. The study followed a quantitative research design, the data of which were collected via a questionnaire. The participants of the study were 10th, 11th and 12th grade students (n = 62). The findings indicated an increase in students' burnout levels. Emotional exhaustion levels are particularly high across all grades. Regarding the impact of sex and grade levels, 12th grade male students have the highest burnout and depersonalization rate while 10th grade female students have a decrease in their professional efficacy levels. Finally, no correlation was found between students' overall burnout and English language proficiency levels.