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In this study, high pressure homogenization (HPH) was applied to hazelnut protein suspensions at 0, 25, 50, 75, 100 and 150 MPa and optical, mechanical, barrier and microstructural properties of edible films produced from these suspensions were determined. HPH treatment resulted in significant reduction to particle size distribution of protein suspensions. The thicknesses of films showed a partial increase due to the effect of increasing pressure, while L* and b* values were decreased. Increasing pressure up to 100 MPa increased the light transmittance of films, but light transmittance at 150 MPa was closed to control. HPH treatment improved the mechanical properties of films while reducing the water vapor permeability and these results were confirmed by microstructural images. HPH treatment up to 75 and 100 MPa has the potential to improve mechanical and barrier properties of films. Thus, the potential of these films for food packaging applications may be increased. [ABSTRACT FROM AUTHOR]