The aim of this study was to evaluate the effect of three different housing systems (individual, pair, group) on the occurrence of dairy calf diseases. The two-year study was performed on 48 calves housed individually, 48 calves in pairs, and 24 calves in groups of four. Monitored indicators during the experiment were the occurrence of diarrhoea and respiratory diseases, the first occurrence of the disease, the duration of illness, and the causative agent of diarrhoea. A significantly higher (p