This study explores the performance of steel-polypropylene hybrid fibrereinforced concrete deep beams across various shear span-to-depth ratio values. Combining the ductility of steel fibres with the crack control properties of polypropylene fibres, the research includes experimental work and numerical calibration using ABAQUS. Various parameters, including load locations and shear span-to-depth ratios (0.5 < a/d < 1.5), are considered alongside different steelpolypropylene fibre ratios. The results indicate that reducing the shear span-to-depth ratio enhances the shear strength of the deep beams and reduces deflection values. additionally, the steel-polypropylene fibres influence the overall behaviour, affecting the load-deflection behaviour and damage patterns highlighting insights for designing efficient deep beams in practical applications.