The paper presents a novel design strategy for creating metainterfaces with specified friction laws, which are interfaces that exhibit predefined relationships between normal and friction forces. The authors propose a generic surface design approach that involves creating dry rough interfaces with simplified surface topographies composed of spherical asperities. By optimizing the individual asperity heights, specific friction laws can be targeted. The strategy is validated through experiments on centimeter-scale elastomer-glass metainterfaces, demonstrating three types of achievable friction laws, including linear laws with specified friction coefficients and unusual non-linear laws. This method provides a scale- and material-independent, chemical-free pathway to energy-saving and adaptable smart interfaces. The design strategy is applicable to a wide range of frictional interfaces and can be extended to control other topography-related quantities, such as interfacial stiffnesses and adhesion forces.The paper presents a novel design strategy for creating metainterfaces with specified friction laws, which are interfaces that exhibit predefined relationships between normal and friction forces. The authors propose a generic surface design approach that involves creating dry rough interfaces with simplified surface topographies composed of spherical asperities. By optimizing the individual asperity heights, specific friction laws can be targeted. The strategy is validated through experiments on centimeter-scale elastomer-glass metainterfaces, demonstrating three types of achievable friction laws, including linear laws with specified friction coefficients and unusual non-linear laws. This method provides a scale- and material-independent, chemical-free pathway to energy-saving and adaptable smart interfaces. The design strategy is applicable to a wide range of frictional interfaces and can be extended to control other topography-related quantities, such as interfacial stiffnesses and adhesion forces.