The purpose of the research was to determine how stocking density affected the behaviour, growth, physiological responses, and leg condition of broilers. 195 five-day old, unsexed Ross strain chicks were randomly allotted into 3 treatments. low stocking density (10 birds/m², LSD), medium stocking density (15 birds/m², MSD) and high stocking density (18 birds/m², HSD). Each treatment had 3 pens (1.5 m²), and approximately four weeks were spent on the study. The HSD demonstrated reduced rates (P < 0.05) of laying, locomotion, eating, preening and longer periods of tonic immobility. Final body weight and total body weight gain were significantly (P < 0.05) reduced in the HSD. Also, HSD group showed increased (P < 0.05) heterophil/lymphocyte ratio, serum corticosterone, glucose and cholesterol, and significantly increased gait issues and footpad and hock burns. However, no significant (P > 0.05) difference was found in litter quality (moisture, ASH, pH) and bone quality (tibiae and femurs measurements) between all treatments. Conclusion, the results indicate that HSD had a negative effect on broiler^'s behaviour and welfare indicators, therefore it should be avoided in poultry farms and further investigations are still required to figure out the best methods for its control.