The present study aimed to investigate the predictors of work stress in elementary and upper-secondary school teachers and school counsellors in the initial period of online education in schools during the COVID-19 pandemic. A total of 964 school professionals (90.7% teachers; 9.3% school counsellors) participated in the study. The results indicated that school professionals who reported higher ICT self-efficacy, had more positive attitudes towards distance education and perceived higher level of supervisor support experienced less stress. In addition, the participants that reported taking care of their own preschool or younger school children during the schools' closure reported higher levels of stress.