The aim of this research was to examine the stress levels biology teachers experience during the COVID-19 pandemic as well as to examine whether there is a correlation between social support at work and in the family with stress level at work. The research was conducted in February 2022 via the online questionnaire. The sample of participants consisted of 145 biology teachers, most of whom were women (93,8%) aged between 23 and 56 years. Most of the participants were primary school teachers (56,6%) with the average of 17 years of service (M=17,1; SD=9,09). 66,2% of participants stated that they live with their partners, 11,7% with parents, while 6,2% of participants stated that they live alone. The remaining 16,6% of participants selected the “something else” category. Furthermore, Depression Anxiety and Stress Scale 21 (DASS-21), Sources of Teacher Stress Scale and Scale of Social Support at Work and in the Family was used in the research. The result of the research indicate that the half of the participants experience normal stress levels, while the other half experience increased stress levels. Support from the superior and colleagues is in a negative correlation with teacher stress. Partner and family support, as well as gender, age, and years of service are not correlated with the level of teacher stress. Support from the superior has proven to be a predictor of teacher stress.