Roughness may refer to:
Surface roughness, the roughness of a surface Roughness length, roughness as applied in meteorology International Roughness Index, the roughness of a road Hydraulic roughness, the roughness of land and waterway features Roughness (psychophysics) in psychoacoustics refers to the level of dissonance The 'roughness' of a line or surface, measured numerically by the Hausdorff dimension Roughness/resel, the resel/roughness of an image/volume Unnecessary roughness, a type of foul in gridiron football
See also Surface finish