Goniochromism is the property of certain surfaces to change their colour depending on the angle under which they are viewed. From a physics standpoint this is rather uncommon behaviour, and in man-made objects this is usually only found in paints that are specifically designed for the effect.

Examples are pearlescent paints or interference pigments, which are sometimes used for custom paintjobs on cars. Some specially woven fabrics can also exhibit such behaviour. Natural examples of goniochromism can be found in the appearance of certain insects, such as the Morpho butterfly, whose metallic-looking wings exhibit a colour shift depending on the observation angle.